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CBSE_CLASS 10_SCIENCE 2020 (Outside Delhi)_SET 1_6

Total questions: 154

Worksheet time: 2hrs 57mins

Name
Class
Date
1.

Dobereiner's Triads. What is the first statement of the video clip?

a)

Dobereiner's Triads: by 1829 Dobereiner had shown that when

the elements are arranged in the order of increasing atomic masses groups of three elements have similar properties

these groups are called triads

b)

the atomic weight of the middle element in a triad is the arithmetic mean of the other two

c)

Lithium 7 sodium 23 potassium 39

atomic weight of sodium equals 7 plus 39 upon 2 equals 23

d)

lithium sodium and potassium have similar properties they belong to alkali metal group

e)

all of them are metals they react with water to form alkalis and hydrogen

2.

Dobereiner's Triads. What is the second statement of the video clip?

a)

all of them have a valency of one calcium 40 strontium 88 barium 137

b)

the atomic weight of the middle element in a triad is the arithmetic mean of the other two

c)

Lithium 7 sodium 23 potassium 39

atomic weight of sodium equals 7 plus 39 upon 2 equals 23

d)

lithium sodium and potassium have similar properties they belong to alkali metal group

e)

all of them are metals they react with water to form alkalis and hydrogen

3.

Dobereiner's Triads. What is the third statement of the video clip?

a)

all of them have a valency of one calcium 40 strontium 88 barium 137

b)

atomic weight of strontium equals 40 plus 137 upon 2 equal to 88.5

c)

Lithium 7 sodium 23 potassium 39

atomic weight of sodium equals 7 plus 39 upon 2 equals 23

d)

lithium sodium and potassium have similar properties they belong to alkali metal group

e)

all of them are metals they react with water to form alkalis and hydrogen

4.

Dobereiner's Triads. What is the fourth statement of the video clip?

a)

all of them have a valency of one calcium 40 strontium 88 barium 137

b)

atomic weight of strontium equals 40 plus 137 upon 2 equal to 88.5

c)

calcium strontium and barium form triad. they belong to alkaline earth metal group

d)

lithium sodium and potassium have similar properties they belong to alkali metal group

e)

all of them are metals they react with water to form alkalis and hydrogen

5.

Dobereiner's Triads. What is the fifth statement of the video clip?

a)

all of them have a valency of one calcium 40 strontium 88 barium 137

b)

atomic weight of strontium equals 40 plus 137 upon 2 equal to 88.5

c)

calcium strontium and barium form triad. they belong to alkaline earth metal group

d)

all these elements are metals oxides of these elements are alkaline in nature

e)

all of them are metals they react with water to form alkalis and hydrogen

6.

Dobereiner's Triads. What is the sixth statement of the video clip?

a)

all of them have a valency of one calcium 40 strontium 88 barium 137

b)

atomic weight of strontium equals 40 plus 137 upon 2 equal to 88.5

c)

calcium strontium and barium form triad. they belong to alkaline earth metal group

d)

all these elements are metals oxides of these elements are alkaline in nature

e)

all these elements have a valency of two chlorine 35.5 bromine 80 iron 127

7.

Dobereiner's Triads. What is the seventh statement of the video clip?

a)

atomic weight of bromine equals 35.5 plus 127 by 2 equal to 81.25

b)

atomic weight of strontium equals 40 plus 137 upon 2 equal to 88.5

c)

calcium strontium and barium form triad. they belong to alkaline earth metal group

d)

all these elements are metals oxides of these elements are alkaline in nature

e)

all these elements have a valency of two chlorine 35.5 bromine 80 iron 127

8.

Dobereiner's Triads. What is the Eighth statement of the video clip?

a)

atomic weight of bromine equals 35.5 plus 127 by 2 equal to 81.25

b)

chlorine bromine and iodine are triads among halogens

all these elements are non-metals

c)

calcium strontium and barium form triad. they belong to alkaline earth metal group

d)

all these elements are metals oxides of these elements are alkaline in nature

e)

all these elements have a valency of two chlorine 35.5 bromine 80 iron 127

9.

Dobereiner's Triads. What is the Ninth statement of the video clip?

a)

atomic weight of bromine equals 35.5 plus 127 by 2 equal to 81.25

b)

chlorine bromine and iodine are triads among halogens

all these elements are non-metals

c)

all of them form acids with water.

all of them are monovalent elements.

d)

all these elements are metals oxides of these elements are alkaline in nature

e)

all these elements have a valency of two chlorine 35.5 bromine 80 iron 127

10.

Dobereiner's Triads. What is the Tenth statement of the video clip?

a)

atomic weight of bromine equals 35.5 plus 127 by 2 equal to 81.25

b)

chlorine bromine and iodine are triads among halogens

all these elements are non-metals

c)

all of them form acids with water.

all of them are monovalent elements.

d)

demerits of Triads: halogens chlorine bromine iodine are difficult to place

e)

all these elements have a valency of two chlorine 35.5 bromine 80 iron 127

11.

Dobereiner's Triads. What is the Eleventh statement of the video clip?

a)

atomic weight of bromine equals 35.5 plus 127 by 2 equal to 81.25

b)

chlorine bromine and iodine are triads among halogens

all these elements are non-metals

c)

all of them form acids with water.

all of them are monovalent elements.

d)

demerits of Triads: halogens chlorine bromine iodine are difficult to place

e)

iron manganese nickel cobalt zinc and copper are six similar elements but cannot be placed in the triad

12.

Dobereiner's Triads. What is the Twelfth statement of the video clip?

a)

atomic weight of bromine equals 35.5 plus 127 by 2 equal to 81.25

b)

chlorine bromine and iodine are triads among halogens

all these elements are non-metals

c)

all of them form acids with water.

all of them are monovalent elements.

d)

demerits of Triads: halogens chlorine bromine iodine are difficult to place

e)

iron manganese nickel cobalt zinc and copper are six similar elements but cannot be placed in the triad

13.

Dobereiner's Triads. What is the Thirteenth statement of the video clip?

a)

atomic weight of bromine equals 35.5 plus 127 by 2 equal to 81.25

b)

chlorine bromine and iodine are triads among halogens

all these elements are non-metals

c)

all of them form acids with water.

all of them are monovalent elements.

d)

demerits of Triads: halogens chlorine bromine iodine are difficult to place

e)

iron manganese nickel cobalt zinc and copper are six similar elements but cannot be placed in the triad

14.

Dobereiner's Triads. What is the Fourteenth statement of the video clip?

a)

atomic weight of bromine equals 35.5 plus 127 by 2 equal to 81.25

b)

chlorine bromine and iodine are triads among halogens

all these elements are non-metals

c)

all of them form acids with water.

all of them are monovalent elements.

d)

demerits of Triads: halogens chlorine bromine iodine are difficult to place

e)

iron manganese nickel cobalt zinc and copper are six similar elements but cannot be placed in the triad

15.

Dobereiner's Triads. What is the Fifteenth statement of the video clip?

a)

atomic weight of bromine equals 35.5 plus 127 by 2 equal to 81.25

b)

chlorine bromine and iodine are triads among halogens

all these elements are non-metals

c)

all of them form acids with water.

all of them are monovalent elements.

d)

demerits of Triads: halogens chlorine bromine iodine are difficult to place

e)

iron manganese nickel cobalt zinc and copper are six similar elements but cannot be placed in the triad

16.

Which set of triads DOES NOT fit Dobereiner's Law of Triads?

a)

lithium, sodium, potassium

b)

calcium, strontium, barium

c)

phosphorus, arsenic, antimony

d)

chlorine, bromine, iodine

17.

The Newlands' law of octaves for the classification of elements was found to be applicable only up to the _______ element

a)

potassium

b)

calcium

c)

cobalt

d)

phosphorus

18.

In which order do we need to put sodium, potassium, lithium, for Dobereiner's Law of Triads ?

a)

lithium, sodium, potassium

b)

sodium, lithium, potassium

c)

potassium ,lithium, sodium

d)

sodium, potassium, lithium

19.

The 'law of octaves' was enunciated by:

a)

Lother Mayer

b)

Mendeleev

c)

Dobereiner

d)

Newlands

20.

On the basis o Newlands classification of elements, the properties of sulphur are similar to those of oxygen because sulphur is the______ element starting from oxygen.

a)

7th

b)

8th

c)

3rd

d)

6th

21.

On what basis were the elements arranged in Dobereiner's triads ?

a)

atomic number

b)

atomic mass

c)

electron number

d)

number of electrons

22.

How many traids did Dobereiner identify among the known elements?

a)

5

b)

3

c)

2

d)

1

23.

Given that X, Y, Z are triads. Atomic masses of X and Z are 32,125 respectively. Then what is the atomic mass of Y is?

a)

157

b)

93

c)

78.5

d)

75.5

24.

A & B are two elements having similar properties which obey the law of octaves. How many elements are there in between A and B?

a)

6

b)

7

c)

8

d)

5

25.

If two members of a Dobereiner traid are calcium and stroncium, the third member of the triad is:

a)

cesium

b)

magnesium

c)

barium

d)

sodium

26.

Which is NOT true of how Dmitri Mendeleev organized the periodic table?

a)

He organized it by atomic mass

b)

He organized it by the number of protons

c)

He grouped elements with similar properties together in columns

d)

He left gaps for elements he believed hadn't been discovered yet and predicted their properties

27.

Which of the following is not a metal?

a)

silicon

b)

manganese

c)

sodium

d)

aluminum

28.

Which of the following elements is a representative element?

a)

Iron

b)

Magnesium

c)

Lanthanum

d)

Actinium

29.

Who is known as the "Father of Chemistry?"

a)

Mendeleev

b)

Moseley

c)

Newlands

d)

Lavoisier

30.

The current periodic table we use today is organized by increasing ________________ and grouped by _________________

a)

atomic mass & valence electrons

b)

atomic number & properties

c)

atomic weight & properties

d)

atomic number & neutrons

31.

Moseley organized the Periodic table by atomic _________, and Mendeleev organized it by atomic ___________

a)

Mass, Number

b)

Number, Mass

c)

Structure, Mass

d)

Number, Isotope

32.
Each column in the periodic table is called a 
a)
period
b)
group
c)
cluster
d)
unit
33.
The atomic number tells you what?
a)
number of electrons
b)
number of protons
c)
number of neutrons
d)
both electrons and protons in an atom.
34.
The period for Bromine is ___________.
a)
3
b)
2
c)
4
35.
The number at the top of each square on the periodic table is the ...
a)
atomic number
b)
atomic mass
c)
Chemical Symbol
d)
Element Name
36.
The horizontal row on the periodic table is called a
a)
group
b)
family
c)
period
d)
atomic number
37.
Which element is found in group 16 period 3?
a)
Sulfur (S)
b)
Selenium (Se)
c)
Chlorine (Cl)
d)
Carbon (C)
38.

Which of the following are physical properties of metal?

a)

Luster

b)

Conductivity

c)

Malleability

d)

Ductility

39.

Which of the following could be properties of nonmetals?

a)

Poor electrical conductivity

b)

Poor thermal conductivity

c)

Dullness

d)

Brittleness

40.

a collection of atoms of one type that cannot be broken down into simpler substances by ordinary chemical or physical means

a)

element

b)

subatomic particle

c)

electron

d)

matter

41.

one of several forms of a single element, which contains the same number of protons, but different numbers of neutrons

a)

isotope

b)

ion

c)

orbital

d)

nucleus

42.

What are elements in groups 3-12 of the periodic table called?

a)

Alkaline Earth Metals

b)

Actinides

c)

Lanthanides

d)

Transition Metals

43.

A rock was found, and it is shiny, brittle, and a semiconductor. What type of element is it?

a)

metal

b)

nonmetal

c)

metalloid

d)

semi-metals

44.

In Rutherford's gold foil experiment, the particles were...

a)

All being deflected because the atom is very dense

b)

Mostly going straight through because the atom is mostly empty space

c)

All going through because the atom is all empty space

45.
How many Valance electrons does Iodine Have?
a)
6
b)
16
c)
7
d)
17
46.

Mendeleev’s Periodic Table. Classification of Elements. What is the first statement of the video clip?

a)

Dmitri Ivanovich Mendeleev played quite a legendary role in the field of chemistry

b)

He not only gave us the simplest and the most efficient method of grouping elements but also laid the foundations of periodic classification of elements that we used today

c)

So in this video let's dedicate some time to understand what and how Mendeleev actually worked on

d)

When Mendeleev began his work of grouping the elements and

arranging them there were almost 63 elements known to him

e)

he was firm on the thought of arranging the elements with respect to their physical as well as chemical properties

47.

Mendeleev’s Periodic Table. Classification of Elements. What is the second statement of the video clip?

a)

He knew that for understanding the chemical properties he

would need to make them react with one or two standard elements

b)

He not only gave us the simplest and the most efficient method of grouping elements but also laid the foundations of periodic classification of elements that we used today

c)

So in this video let's dedicate some time to understand what and how Mendeleev actually worked on

d)

When Mendeleev began his work of grouping the elements and

arranging them there were almost 63 elements known to him

e)

he was firm on the thought of arranging the elements with respect to their physical as well as chemical properties

48.

Mendeleev’s Periodic Table. Classification of Elements. What is the third statement of the video clip?

a)

He knew that for understanding the chemical properties he

would need to make them react with one or two standard elements

b)

for this he chose hydrogen and oxygen but why? Mendeleev thought of making the elements react with hydrogen and oxygen because of the following reasons

c)

So in this video let's dedicate some time to understand what and how Mendeleev actually worked on

d)

When Mendeleev began his work of grouping the elements and

arranging them there were almost 63 elements known to him

e)

he was firm on the thought of arranging the elements with respect to their physical as well as chemical properties

49.

Mendeleev’s Periodic Table. Classification of Elements. What is the fourth statement of the video clip?

a)

He knew that for understanding the chemical properties he

would need to make them react with one or two standard elements

b)

for this he chose hydrogen and oxygen but why? Mendeleev thought of making the elements react with hydrogen and oxygen because of the following reasons

c)

they are very reactive. they are found readily and they form compounds with most of the elements

d)

When Mendeleev began his work of grouping the elements and

arranging them there were almost 63 elements known to him

e)

he was firm on the thought of arranging the elements with respect to their physical as well as chemical properties

50.

Mendeleev’s Periodic Table. Classification of Elements. What is the Fifth statement of the video clip?

a)

He knew that for understanding the chemical properties he

would need to make them react with one or two standard elements

b)

for this he chose hydrogen and oxygen but why? Mendeleev thought of making the elements react with hydrogen and oxygen because of the following reasons

c)

they are very reactive. they are found readily and they form compounds with most of the elements

d)

yes this helped him understand the chemical properties of

all the reacting elements

e)

he was firm on the thought of arranging the elements with respect to their physical as well as chemical properties

51.

Mendeleev’s Periodic Table. Classification of Elements. What is the Sixth statement of the video clip?

a)

He knew that for understanding the chemical properties he

would need to make them react with one or two standard elements

b)

for this he chose hydrogen and oxygen but why? Mendeleev thought of making the elements react with hydrogen and oxygen because of the following reasons

c)

they are very reactive. they are found readily and they form compounds with most of the elements

d)

yes this helped him understand the chemical properties of

all the reacting elements

e)

later in order to simplify the process he wrote all the physical and chemical properties of each element on 63 different cards

now all he had to do is arrange these cards but that wasn't so simple

52.

Mendeleev’s Periodic Table. Classification of Elements. What is the Seventh statement of the video clip?

a)

so he started arranging the cards in the increasing order of the atomic masses

b)

for this he chose hydrogen and oxygen but why? Mendeleev thought of making the elements react with hydrogen and oxygen because of the following reasons

c)

they are very reactive. they are found readily and they form compounds with most of the elements

d)

yes this helped him understand the chemical properties of

all the reacting elements

e)

later in order to simplify the process he wrote all the physical and chemical properties of each element on 63 different cards

now all he had to do is arrange these cards but that wasn't so simple

53.

Mendeleev’s Periodic Table. Classification of Elements. What is the Eighth statement of the video clip?

a)

so he started arranging the cards in the increasing order of the atomic masses

b)

when he was done pasting all these cards on his wall he had two astonishing observations

c)

they are very reactive. they are found readily and they form compounds with most of the elements

d)

yes this helped him understand the chemical properties of

all the reacting elements

e)

later in order to simplify the process he wrote all the physical and chemical properties of each element on 63 different cards

now all he had to do is arrange these cards but that wasn't so simple

54.

Mendeleev’s Periodic Table. Classification of Elements. What is the Ninth statement of the video clip?

a)

so he started arranging the cards in the increasing order of the atomic masses

b)

when he was done pasting all these cards on his wall he had two astonishing observations

c)

one was that there were a few empty spaces left in the complete table that he formed

d)

yes this helped him understand the chemical properties of

all the reacting elements

e)

later in order to simplify the process he wrote all the physical and chemical properties of each element on 63 different cards

now all he had to do is arrange these cards but that wasn't so simple

55.

Mendeleev’s Periodic Table. Classification of Elements. What is the Tenth statement of the video clip?

a)

so he started arranging the cards in the increasing order of the atomic masses

b)

when he was done pasting all these cards on his wall he had two astonishing observations

c)

one was that there were a few empty spaces left in the complete table that he formed

d)

these positions belong to the elements that were not yet discovered

e)

later in order to simplify the process he wrote all the physical and chemical properties of each element on 63 different cards

now all he had to do is arrange these cards but that wasn't so simple

56.

Mendeleev’s Periodic Table. Classification of Elements. What is the Eleventh statement of the video clip?

a)

so he started arranging the cards in the increasing order of the atomic masses

b)

when he was done pasting all these cards on his wall he had two astonishing observations

c)

one was that there were a few empty spaces left in the complete table that he formed

d)

these positions belong to the elements that were not yet discovered

e)

but Mendeleev had a firm belief that the missing elements did exist and are yet to be discovered

57.

Mendeleev’s Periodic Table. Classification of Elements. What is the Twelfth statement of the video clip?

a)

not only this but he was so confident about the characteristics of these elements that he predicted their properties well in

advance

b)

when he was done pasting all these cards on his wall he had two astonishing observations

c)

one was that there were a few empty spaces left in the complete table that he formed

d)

these positions belong to the elements that were not yet discovered

e)

but Mendeleev had a firm belief that the missing elements did exist and are yet to be discovered

58.

Mendeleev’s Periodic Table. Classification of Elements. What is the Twelfth statement of the video clip?

a)

not only this but he was so confident about the characteristics of these elements that he predicted their properties well in

advance

b)

when he was done pasting all these cards on his wall he had two astonishing observations

c)

one was that there were a few empty spaces left in the complete table that he formed

d)

these positions belong to the elements that were not yet discovered

e)

but Mendeleev had a firm belief that the missing elements did exist and are yet to be discovered

59.

Mendeleev’s Periodic Table. Classification of Elements. What is the Thirteenth statement of the video clip?

a)

not only this but he was so confident about the characteristics of these elements that he predicted their properties well in

advance

b)

later on when the elements were discovered it was found that the property is predicted by Mendeleev for almost a

perfect match

c)

one was that there were a few empty spaces left in the complete table that he formed

d)

these positions belong to the elements that were not yet discovered

e)

but Mendeleev had a firm belief that the missing elements did exist and are yet to be discovered

60.

Mendeleev’s Periodic Table. Classification of Elements. What is the Fourteenth statement of the video clip?

a)

not only this but he was so confident about the characteristics of these elements that he predicted their properties well in

advance

b)

later on when the elements were discovered it was found that the property is predicted by Mendeleev for almost a

perfect match

c)

second observation that Mendeleev had was the recurrence of the physical and chemical properties of these elements

d)

these positions belong to the elements that were not yet discovered

e)

but Mendeleev had a firm belief that the missing elements did exist and are yet to be discovered

61.

Mendeleev’s Periodic Table. Classification of Elements. What is the Fifteenth statement of the video clip?

a)

not only this but he was so confident about the characteristics of these elements that he predicted their properties well in

advance

b)

later on when the elements were discovered it was found that the property is predicted by Mendeleev for almost a

perfect match

c)

second observation that Mendeleev had was the recurrence of the physical and chemical properties of these elements

d)

when arranged in a systematic manner it was found that the

physical and chemical properties of elements record at a particular interval of frequency

e)

but Mendeleev had a firm belief that the missing elements did exist and are yet to be discovered

62.

Mendeleev’s Periodic Table. Classification of Elements. What is the Sixteenth statement of the video clip?

a)

not only this but he was so confident about the characteristics of these elements that he predicted their properties well in

advance

b)

later on when the elements were discovered it was found that the property is predicted by Mendeleev for almost a

perfect match

c)

second observation that Mendeleev had was the recurrence of the physical and chemical properties of these elements

d)

when arranged in a systematic manner it was found that the

physical and chemical properties of elements record at a particular interval of frequency

e)

with this Mendeleev came up with a law he named it as the periodic law

63.

Mendeleev’s Periodic Table. Classification of Elements. What is the Seventeenth statement of the video clip?

a)

the law stated that properties of elements are periodic functions of the atomic masses

b)

later on when the elements were discovered it was found that the property is predicted by Mendeleev for almost a

perfect match

c)

second observation that Mendeleev had was the recurrence of the physical and chemical properties of these elements

d)

when arranged in a systematic manner it was found that the

physical and chemical properties of elements record at a particular interval of frequency

e)

with this Mendeleev came up with a law he named it as the periodic law

64.

Mendeleev’s Periodic Table. Classification of Elements. What is the Eighteenth statement of the video clip?

a)

the law stated that properties of elements are periodic functions of the atomic masses

b)

now what do we exactly mean by this let's simplify this by

breaking the statement in parts

c)

second observation that Mendeleev had was the recurrence of the physical and chemical properties of these elements

d)

when arranged in a systematic manner it was found that the

physical and chemical properties of elements record at a particular interval of frequency

e)

with this Mendeleev came up with a law he named it as the periodic law

65.

Mendeleev’s Periodic Table. Classification of Elements. What is the Nineteenth statement of the video clip?

a)

the law stated that properties of elements are periodic functions of the atomic masses

b)

now what do we exactly mean by this let's simplify this by

breaking the statement in parts

c)

properties of elements means the physical and chemical properties of all the elements in the table are periodic functions means those which occur at regular intervals

d)

when arranged in a systematic manner it was found that the

physical and chemical properties of elements record at a particular interval of frequency

e)

with this Mendeleev came up with a law he named it as the periodic law

66.

Mendeleev’s Periodic Table. Classification of Elements. What is the Twentieth statement of the video clip?

a)

the law stated that properties of elements are periodic functions of the atomic masses

b)

now what do we exactly mean by this let's simplify this by

breaking the statement in parts

c)

properties of elements means the physical and chemical properties of all the elements in the table are periodic functions means those which occur at regular intervals

d)

and lastly of the atomic masses means when arranged in

the increasing order of the atomic masses

e)

with this Mendeleev came up with a law he named it as the periodic law

67.

Mendeleev’s Periodic Table. Classification of Elements. What is the Twenty-First statement of the video clip?

a)

the law stated that properties of elements are periodic functions of the atomic masses

b)

now what do we exactly mean by this let's simplify this by

breaking the statement in parts

c)

properties of elements means the physical and chemical properties of all the elements in the table are periodic functions means those which occur at regular intervals

d)

and lastly of the atomic masses means when arranged in

the increasing order of the atomic masses

e)

so can we simply say that when elements are arranged in the increasing order of the atomic masses

68.

Mendeleev’s Periodic Table. Classification of Elements. What is the Twenty-Second statement of the video clip?

a)

they show similarities in the physical and chemical properties at regular intervals

b)

now what do we exactly mean by this let's simplify this by

breaking the statement in parts

c)

properties of elements means the physical and chemical properties of all the elements in the table are periodic functions means those which occur at regular intervals

d)

and lastly of the atomic masses means when arranged in

the increasing order of the atomic masses

e)

so can we simply say that when elements are arranged in the increasing order of the atomic masses

69.

Mendeleev’s Periodic Table. Classification of Elements. What is the Twenty-Third statement of the video clip?

a)

they show similarities in the physical and chemical properties at regular intervals

b)

yes that's what Mendeleev meant. this is how Mendeleev let the foundations for the modern periodic table

c)

properties of elements means the physical and chemical properties of all the elements in the table are periodic functions means those which occur at regular intervals

d)

and lastly of the atomic masses means when arranged in

the increasing order of the atomic masses

e)

so can we simply say that when elements are arranged in the increasing order of the atomic masses

70.

Mendeleev’s Periodic Table. Classification of Elements. What is the Twenty-Fourth statement of the video clip?

a)

they show similarities in the physical and chemical properties at regular intervals

b)

yes that's what Mendeleev meant. this is how Mendeleev let the foundations for the modern periodic table

c)

but did this great contribution by Mendeleev have no limitations at all

d)

and lastly of the atomic masses means when arranged in

the increasing order of the atomic masses

e)

so can we simply say that when elements are arranged in the increasing order of the atomic masses

71.

Mendeleev’s Periodic Table. Classification of Elements. What is the Twenty-Fifth statement of the video clip?

a)

they show similarities in the physical and chemical properties at regular intervals

b)

yes that's what Mendeleev meant. this is how Mendeleev let the foundations for the modern periodic table

c)

but did this great contribution by Mendeleev have no limitations at all

d)

well there were a few that emerged with time. let's discuss the

achievements and the limitations of Mendeleev's work in the next video

e)

so can we simply say that when elements are arranged in the increasing order of the atomic masses

72.

Mendeleev’s Periodic Table. Classification of Elements. What is the Twenty-Sixth statement of the video clip?

a)

they show similarities in the physical and chemical properties at regular intervals

b)

yes that's what Mendeleev meant. this is how Mendeleev let the foundations for the modern periodic table

c)

but did this great contribution by Mendeleev have no limitations at all

d)

well there were a few that emerged with time. let's discuss the

achievements and the limitations of Mendeleev's work in the next video

e)

so can we simply say that when elements are arranged in the increasing order of the atomic masses

73.

Mendeleev’s Periodic Table. Classification of Elements. What is the Twenty-Seventh statement of the video clip?

a)

they show similarities in the physical and chemical properties at regular intervals

b)

yes that's what Mendeleev meant. this is how Mendeleev let the foundations for the modern periodic table

c)

but did this great contribution by Mendeleev have no limitations at all

d)

well there were a few that emerged with time. let's discuss the

achievements and the limitations of Mendeleev's work in the next video

e)

so can we simply say that when elements are arranged in the increasing order of the atomic masses

74.

Mendeleev’s Periodic Table. Classification of Elements. What is the Twenty-Eighth statement of the video clip?

a)

they show similarities in the physical and chemical properties at regular intervals

b)

yes that's what Mendeleev meant. this is how Mendeleev let the foundations for the modern periodic table

c)

but did this great contribution by Mendeleev have no limitations at all

d)

well there were a few that emerged with time. let's discuss the

achievements and the limitations of Mendeleev's work in the next video

e)

so can we simply say that when elements are arranged in the increasing order of the atomic masses

75.

Mendeleev’s Periodic Table. Classification of Elements. What is the Twenty-Ninth statement of the video clip?

a)

they show similarities in the physical and chemical properties at regular intervals

b)

yes that's what Mendeleev meant. this is how Mendeleev let the foundations for the modern periodic table

c)

but did this great contribution by Mendeleev have no limitations at all

d)

well there were a few that emerged with time. let's discuss the

achievements and the limitations of Mendeleev's work in the next video

e)

so can we simply say that when elements are arranged in the increasing order of the atomic masses

76.
Each column in the periodic table is called a 
a)
period
b)
group
c)
cluster
d)
unit
77.
The atomic number tells you what?
a)
number of electrons
b)
number of protons
c)
number of neutrons
d)
both electrons and protons in an atom.
78.
Which group of the periodic table is composed of inert (not reactive)  gases?
a)
alkali metals
b)
alkaline earth metals
c)
halogens
d)
noble gases
79.
Elements which are shiny, conduct electricity and heat are called
a)
metal
b)
nonmetal
c)
metalloid
d)
nonexistent
80.
The atoms along the staircase are called 
a)
metals
b)
nonmetals
c)
metalloids
d)
noble gases
81.
How many neutrons are in a Gold atom?
a)
79
b)
196
c)
118
d)
275
82.
How many electrons does a Copper atom have?
a)
63
b)
29
c)
92
d)
34
83.
What's a valence electron?
a)
electrons in the second energy level
b)
electrons in the outermost energy level
c)
the atomic number
d)
electrons in the first level
84.
What does the 1.00794 stand for?
a)
Hydrogen
b)
atomic number
c)
atomic mass
d)
atomic explosion
85.
The positive particles of an atom are 
a)
electrons 
b)
positrons 
c)
neutrons 
d)
protons 
86.
Particles in an atom that are neutral and have no charge are 
a)
negatrons 
b)
electrons 
c)
neutrons 
d)
protons 
87.
The electrons of an atom are found...
a)
in the outer "cloud" surrounding the atom.
b)
in the nucleus of the atom.
c)
in the cloud and in the nucleus.
88.
The subatomic particle with a negative charge is the
a)
electron
b)
proton
c)
neutron
d)
nucleus 
89.
What is the atomic mass equal to?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
90.
In the modern periodic table elements are arranged by:
a)
atomic mass
b)
atomic number
c)
valence electrons
d)
number of isotopes
91.

Newland's law of octaves. What is the first statement of the video clip?

a)

Newlands Law of Octaves

In 1864, Newlands arranged elements in ascending order of atomic weights.

b)

According to him the eighth element starting from a given

one is a kind of repetition of the first like the eight notes of an octave of music

c)

He called this relationship as law of octaves merits of Newlands arrangement

d)

Newlands was the first chemist to give a number to an element places left by newlands for elements are still undiscovered

e)

Newlands altered positions of elements example tellurium and iodine when the atomic weights place them in the wrong order

92.

Newland's law of octaves. What is the second statement of the video clip?

a)

The periodicity as a property was recognized for the first time

limitations of Newland's Law of Octaves

b)

According to him the eighth element starting from a given

one is a kind of repetition of the first like the eight notes of an octave of music

c)

He called this relationship as law of octaves merits of Newlands arrangement

d)

Newlands was the first chemist to give a number to an element places left by newlands for elements are still undiscovered

e)

Newlands altered positions of elements example tellurium and iodine when the atomic weights place them in the wrong order

93.

Newland's law of octaves. What is the third statement of the video clip?

a)

The periodicity as a property was recognized for the first time

limitations of Newland's Law of Octaves

b)

It was assumed by mueller that only 56 elements existed in nature Law of Octaves worked well for the first 17 elements

c)

He called this relationship as law of octaves merits of Newlands arrangement

d)

Newlands was the first chemist to give a number to an element places left by newlands for elements are still undiscovered

e)

Newlands altered positions of elements example tellurium and iodine when the atomic weights place them in the wrong order

94.

Newland's law of octaves. What is the Fourth statement of the video clip?

a)

The periodicity as a property was recognized for the first time

limitations of Newland's Law of Octaves

b)

It was assumed by mueller that only 56 elements existed in nature Law of Octaves worked well for the first 17 elements

c)

Newland adjusted the two elements in the same position in order to fit elements into his table and also put unlike elements in the same column

d)

Newlands was the first chemist to give a number to an element places left by newlands for elements are still undiscovered

e)

Newlands altered positions of elements example tellurium and iodine when the atomic weights place them in the wrong order

95.

Newland's law of octaves. What is the Fifth statement of the video clip?

a)

The periodicity as a property was recognized for the first time

limitations of Newland's Law of Octaves

b)

It was assumed by mueller that only 56 elements existed in nature Law of Octaves worked well for the first 17 elements

c)

Newland adjusted the two elements in the same position in order to fit elements into his table and also put unlike elements in the same column

d)

After the discovery of noble gases the eighth element no longer remained a similar element

e)

Newlands altered positions of elements example tellurium and iodine when the atomic weights place them in the wrong order

96.

Newland's law of octaves. What is the Sixth statement of the video clip?

a)

The periodicity as a property was recognized for the first time

limitations of Newland's Law of Octaves

b)

It was assumed by mueller that only 56 elements existed in nature Law of Octaves worked well for the first 17 elements

c)

Newland adjusted the two elements in the same position in order to fit elements into his table and also put unlike elements in the same column

d)

After the discovery of noble gases the eighth element no longer remained a similar element

e)

Newlands altered positions of elements example tellurium and iodine when the atomic weights place them in the wrong order

97.

Newland's law of octaves. What is the Sixth statement of the video clip?

a)

The periodicity as a property was recognized for the first time

limitations of Newland's Law of Octaves

b)

It was assumed by mueller that only 56 elements existed in nature Law of Octaves worked well for the first 17 elements

c)

Newland adjusted the two elements in the same position in order to fit elements into his table and also put unlike elements in the same column

d)

After the discovery of noble gases the eighth element no longer remained a similar element

e)

Newlands altered positions of elements example tellurium and iodine when the atomic weights place them in the wrong order

98.

Newland's law of octaves. What is the Seventh statement of the video clip?

a)

The periodicity as a property was recognized for the first time

limitations of Newland's Law of Octaves

b)

It was assumed by mueller that only 56 elements existed in nature Law of Octaves worked well for the first 17 elements

c)

Newland adjusted the two elements in the same position in order to fit elements into his table and also put unlike elements in the same column

d)

After the discovery of noble gases the eighth element no longer remained a similar element

e)

Newlands altered positions of elements example tellurium and iodine when the atomic weights place them in the wrong order

99.

Newland's law of octaves. What is the Eighth statement of the video clip?

a)

The periodicity as a property was recognized for the first time

limitations of Newland's Law of Octaves

b)

It was assumed by mueller that only 56 elements existed in nature Law of Octaves worked well for the first 17 elements

c)

Newland adjusted the two elements in the same position in order to fit elements into his table and also put unlike elements in the same column

d)

After the discovery of noble gases the eighth element no longer remained a similar element

e)

Newlands altered positions of elements example tellurium and iodine when the atomic weights place them in the wrong order

100.

Newland's law of octaves. What is the Eighth statement of the video clip?

a)

The periodicity as a property was recognized for the first time

limitations of Newland's Law of Octaves

b)

It was assumed by mueller that only 56 elements existed in nature Law of Octaves worked well for the first 17 elements

c)

Newland adjusted the two elements in the same position in order to fit elements into his table and also put unlike elements in the same column

d)

After the discovery of noble gases the eighth element no longer remained a similar element

e)

Newlands altered positions of elements example tellurium and iodine when the atomic weights place them in the wrong order

101.

Newland's law of octaves. What is the Ninth statement of the video clip?

a)

The periodicity as a property was recognized for the first time

limitations of Newland's Law of Octaves

b)

It was assumed by mueller that only 56 elements existed in nature Law of Octaves worked well for the first 17 elements

c)

Newland adjusted the two elements in the same position in order to fit elements into his table and also put unlike elements in the same column

d)

After the discovery of noble gases the eighth element no longer remained a similar element

e)

Newlands altered positions of elements example tellurium and iodine when the atomic weights place them in the wrong order

102.
What is a producer? 
a)
Organism that creates their own food.
b)
Organism that eat other organisms for energy
c)
Organism that eat other dead organisms
103.
What is a consumer? 
a)
Organism that creates their own food.
b)
Organism that eat other organisms for energy
c)
Organism that eat other dead organisms
104.
What is a decomposer? 
a)
Organism that creates their own food.
b)
Organism that eat other organisms for energy
c)
Organism that eat other dead organisms
105.
What do Omnivores eat? 
a)
Plants ONLY 
b)
Animals ONLY
c)
Plants AND Animals
106.
What do Herbivores eat? 
a)
Plants ONLY 
b)
Animals ONLY
c)
Plants AND Animals
107.
What do Carnivores eat? 
a)
Plants ONLY 
b)
Animals ONLY
c)
Plants AND Animals
108.
What animal is on the top of the food chain? 
*Remember Humans are on the top of all food chains because we do not get hunted. 
a)
Grass
b)
Grasshopper
c)
Mouse
d)
Owl
109.
Who does the owl get energy from? 
a)
Grass
b)
Grasshopper
c)
Mouse
d)
Ow
110.
Who is the producer in this food chain? 
a)
Grass
b)
Grasshopper
c)
Mouse
d)
Ow
111.
Who does the grasshopper get energy from? 
a)
Grass
b)
Grasshopper
c)
Mouse
d)
Ow
112.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the first statement of the video clip?

a)

hello everyone. In the last video we have seen different examples of the food chain.

b)

we have seen how food is transferred from one organism to another organism in a perfect sequence

c)

each organism in the food chain belongs to a particular category or a particular group of organisms which behaves identically

d)

when it comes to obtaining energy these groups form different steps in the food chain and are called as trophic levels

e)

in other words we can say each organism in the food chain represents a trophic level

113.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Second statement of the video clip?

a)

in the pond ecosystem which we have seen previously the first link of the food chain was phytoplankton

b)

we have seen how food is transferred from one organism to another organism in a perfect sequence

c)

each organism in the food chain belongs to a particular category or a particular group of organisms which behaves identically

d)

when it comes to obtaining energy these groups form different steps in the food chain and are called as trophic levels

e)

in other words we can say each organism in the food chain represents a trophic level

114.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Third statement of the video clip?

a)

in the pond ecosystem which we have seen previously the first link of the food chain was phytoplankton

b)

they make their own food and are known as producers so they form the first trophic level of the food chain

c)

each organism in the food chain belongs to a particular category or a particular group of organisms which behaves identically

d)

when it comes to obtaining energy these groups form different steps in the food chain and are called as trophic levels

e)

in other words we can say each organism in the food chain represents a trophic level

115.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Fourth statement of the video clip?

a)

in the pond ecosystem which we have seen previously the first link of the food chain was phytoplankton

b)

they make their own food and are known as producers so they form the first trophic level of the food chain

c)

they were eaten by the zoo plantings which are herbivores. These are herbivores are also known as zooplanktons.

d)

when it comes to obtaining energy these groups form different steps in the food chain and are called as trophic levels

e)

in other words we can say each organism in the food chain represents a trophic level

116.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Fifth statement of the video clip?

a)

in the pond ecosystem which we have seen previously the first link of the food chain was phytoplankton

b)

they make their own food and are known as producers so they form the first trophic level of the food chain

c)

they were eaten by the zoo plantings which are herbivores. These are herbivores are also known as zooplanktons.

d)

these herbivores are also called as primary consumers and form the second trophic level small carnivores like fishes eat the zooplankton

e)

in other words we can say each organism in the food chain represents a trophic level

117.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Sixth statement of the video clip?

a)

in the pond ecosystem which we have seen previously the first link of the food chain was phytoplankton

b)

they make their own food and are known as producers so they form the first trophic level of the food chain

c)

they were eaten by the zoo plantings which are herbivores. These are herbivores are also known as zooplanktons.

d)

these herbivores are also called as primary consumers and form the second trophic level small carnivores like fishes eat the zooplankton

e)

they are the secondary consumers and form the third trophic

118.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Sixth statement of the video clip?

a)

in the pond ecosystem which we have seen previously the first link of the food chain was phytoplankton

b)

they make their own food and are known as producers so they form the first trophic level of the food chain

c)

they were eaten by the zoo plantings which are herbivores. These are herbivores are also known as zooplanktons.

d)

these herbivores are also called as primary consumers and form the second trophic level small carnivores like fishes eat the zooplankton

e)

they are the secondary consumers and form the third trophic

119.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Seventh statement of the video clip?

a)

largely the birds which eat the fishes are large carnivores they are the tertiary consumers and formed a fourth trophic

level

b)

they make their own food and are known as producers so they form the first trophic level of the food chain

c)

they were eaten by the zoo plantings which are herbivores. These are herbivores are also known as zooplanktons.

d)

these herbivores are also called as primary consumers and form the second trophic level small carnivores like fishes eat the zooplankton

e)

they are the secondary consumers and form the third trophic level

120.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Eighth statement of the video clip?

a)

largely the birds which eat the fishes are large carnivores they are the tertiary consumers and formed a fourth trophic

level

b)

as we move upward in the food chain

the number of organisms decreases which means at the lowest trophic level

c)

they were eaten by the zoo plantings which are herbivores. These are herbivores are also known as zooplanktons.

d)

these herbivores are also called as primary consumers and form the second trophic level small carnivores like fishes eat the zooplankton

e)

they are the secondary consumers and form the third trophic level

121.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Ninth statement of the video clip?

a)

largely the birds which eat the fishes are large carnivores they are the tertiary consumers and formed a fourth trophic

level

b)

as we move upward in the food chain

the number of organisms decreases which means at the lowest trophic level

c)

the number of organisms will be maximum and therefore in the food chain the greatest number is of producers

d)

these herbivores are also called as primary consumers and form the second trophic level small carnivores like fishes eat the zooplankton

e)

they are the secondary consumers and form the third trophic level

122.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Tenth statement of the video clip?

a)

largely the birds which eat the fishes are large carnivores they are the tertiary consumers and formed a fourth trophic

level

b)

as we move upward in the food chain

the number of organisms decreases which means at the lowest trophic level

c)

the number of organisms will be maximum and therefore in the food chain the greatest number is of producers

d)

they can be represented by the number pyramid now here you can see the number pyramid

e)

they are the secondary consumers and form the third trophic level

123.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Eleventh statement of the video clip?

a)

largely the birds which eat the fishes are large carnivores they are the tertiary consumers and formed a fourth trophic

level

b)

as we move upward in the food chain

the number of organisms decreases which means at the lowest trophic level

c)

the number of organisms will be maximum and therefore in the food chain the greatest number is of producers

d)

they can be represented by the number pyramid now here you can see the number pyramid

e)

now since we know that the number of producers is most so at the lowest level will be the producers then after the producers are the herbivores or the primary consumers

124.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Eleventh statement of the video clip?

a)

largely the birds which eat the fishes are large carnivores they are the tertiary consumers and formed a fourth trophic

level

b)

as we move upward in the food chain

the number of organisms decreases which means at the lowest trophic level

c)

the number of organisms will be maximum and therefore in the food chain the greatest number is of producers

d)

they can be represented by the number pyramid now here you can see the number pyramid

e)

now since we know that the number of producers is most so at the lowest level will be the producers then after the producers are the herbivores or the primary consumers

125.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Twelfth statement of the video clip?

a)

then comes the secondary consumers followed by the tertiary consumers in case of pond ecosystem

b)

as we move upward in the food chain

the number of organisms decreases which means at the lowest trophic level

c)

the number of organisms will be maximum and therefore in the food chain the greatest number is of producers

d)

they can be represented by the number pyramid now here you can see the number pyramid

e)

now since we know that the number of producers is most so at the lowest level will be the producers then after the producers are the herbivores or the primary consumers

126.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Thirteenth statement of the video clip?

a)

then comes the secondary consumers followed by the tertiary consumers in case of pond ecosystem

b)

the phytoplankton are the producers so they will be placed at the lowest level followed by the zooplankton

c)

the number of organisms will be maximum and therefore in the food chain the greatest number is of producers

d)

they can be represented by the number pyramid now here you can see the number pyramid

e)

now since we know that the number of producers is most so at the lowest level will be the producers then after the producers are the herbivores or the primary consumers

127.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Fourteenth statement of the video clip?

a)

then comes the secondary consumers followed by the tertiary consumers in case of pond ecosystem

b)

the phytoplankton are the producers so they will be placed at the lowest level followed by the zooplankton

c)

fishes and birds some food chains have less number of trophic levels in them

d)

they can be represented by the number pyramid now here you can see the number pyramid

e)

now since we know that the number of producers is most so at the lowest level will be the producers then after the producers are the herbivores or the primary consumers

128.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Fourteenth statement of the video clip?

a)

then comes the secondary consumers followed by the tertiary consumers in case of pond ecosystem

b)

the phytoplankton are the producers so they will be placed at the lowest level followed by the zooplankton

c)

fishes and birds some food chains have less number of trophic levels in them

d)

they can be represented by the number pyramid now here you can see the number pyramid

e)

now since we know that the number of producers is most so at the lowest level will be the producers then after the producers are the herbivores or the primary consumers

129.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Fifteenth statement of the video clip?

a)

then comes the secondary consumers followed by the tertiary consumers in case of pond ecosystem

b)

the phytoplankton are the producers so they will be placed at the lowest level followed by the zooplankton

c)

fishes and birds some food chains have less number of trophic levels in them

d)

for example in the case of forest ecosystem there are only 3 trophic levels

e)

now since we know that the number of producers is most so at the lowest level will be the producers then after the producers are the herbivores or the primary consumers

130.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Sixteenth statement of the video clip?

a)

then comes the secondary consumers followed by the tertiary consumers in case of pond ecosystem

b)

the phytoplankton are the producers so they will be placed at the lowest level followed by the zooplankton

c)

fishes and birds some food chains have less number of trophic levels in them

d)

for example in the case of forest ecosystem there are only 3 trophic levels

e)

grass or plants which are the producers forms the first trophic level.

131.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Seventeenth statement of the video clip?

a)

the deer is the primary consumer and forms the second trophic level

b)

the phytoplankton are the producers so they will be placed at the lowest level followed by the zooplankton

c)

fishes and birds some food chains have less number of trophic levels in them

d)

for example in the case of forest ecosystem there are only 3 trophic levels

e)

grass or plants which are the producers forms the first trophic level.

132.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Eighteenth statement of the video clip?

a)

the deer is the primary consumer and forms the second trophic level

b)

lion which is the tertiary consumer forms a third trophic level the secondary consumer is not present in this food chain now we know that energy is transferred from one organism to another in the food chain

c)

fishes and birds some food chains have less number of trophic levels in them

d)

for example in the case of forest ecosystem there are only 3 trophic levels

e)

grass or plants which are the producers forms the first trophic level.

133.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Nineteenth statement of the video clip?

a)

the deer is the primary consumer and forms the second trophic level

b)

lion which is the tertiary consumer forms a third trophic level the secondary consumer is not present in this food chain now we know that energy is transferred from one organism to another in the food chain

c)

so energy is flowing between different trophic levels

d)

for example in the case of forest ecosystem there are only 3 trophic levels

e)

grass or plants which are the producers forms the first trophic level.

134.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Twentieth statement of the video clip?

a)

the deer is the primary consumer and forms the second trophic level

b)

lion which is the tertiary consumer forms a third trophic level the secondary consumer is not present in this food chain now we know that energy is transferred from one organism to another in the food chain

c)

so energy is flowing between different trophic levels

d)

first of all the producers use the sunlight to produce food and the solar energy is converted into the chemical energy and from there this energy is transferred between different trophic levels

e)

grass or plants which are the producers forms the first trophic level.

135.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Twenty-First statement of the video clip?

a)

the deer is the primary consumer and forms the second trophic level

b)

lion which is the tertiary consumer forms a third trophic level the secondary consumer is not present in this food chain now we know that energy is transferred from one organism to another in the food chain

c)

so energy is flowing between different trophic levels

d)

first of all the producers use the sunlight to produce food and the solar energy is converted into the chemical energy and from there this energy is transferred between different trophic levels

e)

here you can see the sequence of flow of energy between the different trophic levels from the producers the energy is transferred to the herbivores

136.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Twenty-Second statement of the video clip?

a)

from herbivores to the small carnivores and from the small carnivores the energy is flows to the top carnivores

b)

lion which is the tertiary consumer forms a third trophic level the secondary consumer is not present in this food chain now we know that energy is transferred from one organism to another in the food chain

c)

so energy is flowing between different trophic levels

d)

first of all the producers use the sunlight to produce food and the solar energy is converted into the chemical energy and from there this energy is transferred between different trophic levels

e)

here you can see the sequence of flow of energy between the different trophic levels from the producers the energy is transferred to the herbivores

137.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Twenty-Third statement of the video clip?

a)

from herbivores to the small carnivores and from the small carnivores the energy is flows to the top carnivores

b)

now during the flow of energy all energy is not transferred and some energy is lost in each step

c)

so energy is flowing between different trophic levels

d)

first of all the producers use the sunlight to produce food and the solar energy is converted into the chemical energy and from there this energy is transferred between different trophic levels

e)

here you can see the sequence of flow of energy between the different trophic levels from the producers the energy is transferred to the herbivores

138.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Twenty-Fourth statement of the video clip?

a)

from herbivores to the small carnivores and from the small carnivores the energy is flows to the top carnivores

b)

now during the flow of energy all energy is not transferred and some energy is lost in each step

c)

we already know that one form of energy when gets converted into another some of it is lost in the process and cannot be used again

d)

first of all the producers use the sunlight to produce food and the solar energy is converted into the chemical energy and from there this energy is transferred between different trophic levels

e)

here you can see the sequence of flow of energy between the different trophic levels from the producers the energy is transferred to the herbivores

139.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Twenty-Fifth statement of the video clip?

a)

from herbivores to the small carnivores and from the small carnivores the energy is flows to the top carnivores

b)

now during the flow of energy all energy is not transferred and some energy is lost in each step

c)

we already know that one form of energy when gets converted into another some of it is lost in the process and cannot be used again

d)

according to the studies only 1% of the total energy of the sunlight is converted by the green plants into the chemical energy

e)

here you can see the sequence of flow of energy between the different trophic levels from the producers the energy is transferred to the herbivores

140.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Twenty-Sixth statement of the video clip?

a)

from herbivores to the small carnivores and from the small carnivores the energy is flows to the top carnivores

b)

now during the flow of energy all energy is not transferred and some energy is lost in each step

c)

we already know that one form of energy when gets converted into another some of it is lost in the process and cannot be used again

d)

according to the studies only 1% of the total energy of the sunlight is converted by the green plants into the chemical energy

e)

when these green plants are consumed by the primary consumers this chemical energy is transferred to them

141.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Twenty-Seventh statement of the video clip?

a)

now during a life of a primary consumer maximum amount of energy is lost into in the form of heat to the environment and some energy is utilized for the process of digestion growth reproduction and doing work

b)

now during the flow of energy all energy is not transferred and some energy is lost in each step

c)

we already know that one form of energy when gets converted into another some of it is lost in the process and cannot be used again

d)

according to the studies only 1% of the total energy of the sunlight is converted by the green plants into the chemical energy

e)

when these green plants are consumed by the primary consumers this chemical energy is transferred to them

142.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Twenty-Eighth statement of the video clip?

a)

now during a life of a primary consumer maximum amount of energy is lost into in the form of heat to the environment and some energy is utilized for the process of digestion growth reproduction and doing work

b)

studies show that only 10% of the food gets converted in the body of organism and is available for the next level

c)

we already know that one form of energy when gets converted into another some of it is lost in the process and cannot be used again

d)

according to the studies only 1% of the total energy of the sunlight is converted by the green plants into the chemical energy

e)

when these green plants are consumed by the primary consumers this chemical energy is transferred to them

143.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Twenty-Ninth statement of the video clip?

a)

now during a life of a primary consumer maximum amount of energy is lost into in the form of heat to the environment and some energy is utilized for the process of digestion growth reproduction and doing work

b)

studies show that only 10% of the food gets converted in the body of organism and is available for the next level

c)

this data is true for the subsequent trophic levels also this

means that 90% of the energy is lost and only 10% gets converted into organic matter which is transferred to the next

trophic level

d)

according to the studies only 1% of the total energy of the sunlight is converted by the green plants into the chemical energy

e)

when these green plants are consumed by the primary consumers this chemical energy is transferred to them

144.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Thirtiethh statement of the video clip?

a)

now during a life of a primary consumer maximum amount of energy is lost into in the form of heat to the environment and some energy is utilized for the process of digestion growth reproduction and doing work

b)

studies show that only 10% of the food gets converted in the body of organism and is available for the next level

c)

this data is true for the subsequent trophic levels also this

means that 90% of the energy is lost and only 10% gets converted into organic matter which is transferred to the next

trophic level

d)

you can see in this diagram of flow of energy as we move up

e)

when these green plants are consumed by the primary consumers this chemical energy is transferred to them

145.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Thirty-First statement of the video clip?

a)

now during a life of a primary consumer maximum amount of energy is lost into in the form of heat to the environment and some energy is utilized for the process of digestion growth reproduction and doing work

b)

studies show that only 10% of the food gets converted in the body of organism and is available for the next level

c)

this data is true for the subsequent trophic levels also this

means that 90% of the energy is lost and only 10% gets converted into organic matter which is transferred to the next

trophic level

d)

you can see in this diagram of flow of energy as we move up

e)

the amount of available energy decreases. this can be represented by the size of the boxes as less amount of energy is available for the subsequent trophic levels in a food chain

146.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Thirty-Second statement of the video clip?

a)

there are only three to four trophic levels. one important thing to note here is that that the flow of energy is unidirectional which means energy once taken can not be reverted back

b)

studies show that only 10% of the food gets converted in the body of organism and is available for the next level

c)

this data is true for the subsequent trophic levels also this

means that 90% of the energy is lost and only 10% gets converted into organic matter which is transferred to the next

trophic level

d)

you can see in this diagram of flow of energy as we move up

e)

the amount of available energy decreases. this can be represented by the size of the boxes as less amount of energy is available for the subsequent trophic levels in a food chain

147.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Thirty-Second statement of the video clip?

a)

there are only three to four trophic levels. one important thing to note here is that that the flow of energy is unidirectional which means energy once taken can not be reverted back

b)

studies show that only 10% of the food gets converted in the body of organism and is available for the next level

c)

this data is true for the subsequent trophic levels also this

means that 90% of the energy is lost and only 10% gets converted into organic matter which is transferred to the next

trophic level

d)

you can see in this diagram of flow of energy as we move up

e)

the amount of available energy decreases. this can be represented by the size of the boxes as less amount of energy is available for the subsequent trophic levels in a food chain

148.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Thirty-Third statement of the video clip?

a)

there are only three to four trophic levels. one important thing to note here is that that the flow of energy is unidirectional which means energy once taken can not be reverted back

b)

for example the solar energy which is taken up by the plants does not go back to the Sun and similarly when the herbivores take the energy from the plant it does not go back to the plants

c)

this data is true for the subsequent trophic levels also this

means that 90% of the energy is lost and only 10% gets converted into organic matter which is transferred to the next

trophic level

d)

you can see in this diagram of flow of energy as we move up

e)

the amount of available energy decreases. this can be represented by the size of the boxes as less amount of energy is available for the subsequent trophic levels in a food chain

149.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Thirty-Fourth statement of the video clip?

a)

there are only three to four trophic levels. one important thing to note here is that that the flow of energy is unidirectional which means energy once taken can not be reverted back

b)

for example the solar energy which is taken up by the plants does not go back to the Sun and similarly when the herbivores take the energy from the plant it does not go back to the plants

c)

so in this video we have seen what is trophic levels and how energy flows between them

d)

you can see in this diagram of flow of energy as we move up

e)

the amount of available energy decreases. this can be represented by the size of the boxes as less amount of energy is available for the subsequent trophic levels in a food chain

150.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Thirty-Fifth statement of the video clip?

a)

there are only three to four trophic levels. one important thing to note here is that that the flow of energy is unidirectional which means energy once taken can not be reverted back

b)

for example the solar energy which is taken up by the plants does not go back to the Sun and similarly when the herbivores take the energy from the plant it does not go back to the plants

c)

so in this video we have seen what is trophic levels and how energy flows between them

d)

in the next video we are going to see the food web and the

biological magnification

e)

the amount of available energy decreases. this can be represented by the size of the boxes as less amount of energy is available for the subsequent trophic levels in a food chain

151.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Thirty-Sixth statement of the video clip?

a)

there are only three to four trophic levels. one important thing to note here is that that the flow of energy is unidirectional which means energy once taken can not be reverted back

b)

for example the solar energy which is taken up by the plants does not go back to the Sun and similarly when the herbivores take the energy from the plant it does not go back to the plants

c)

so in this video we have seen what is trophic levels and how energy flows between them

d)

in the next video we are going to see the food web and the

biological magnification

e)

the amount of available energy decreases. this can be represented by the size of the boxes as less amount of energy is available for the subsequent trophic levels in a food chain

152.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Thirty-Seventh statement of the video clip?

a)

there are only three to four trophic levels. one important thing to note here is that that the flow of energy is unidirectional which means energy once taken can not be reverted back

b)

for example the solar energy which is taken up by the plants does not go back to the Sun and similarly when the herbivores take the energy from the plant it does not go back to the plants

c)

so in this video we have seen what is trophic levels and how energy flows between them

d)

in the next video we are going to see the food web and the

biological magnification

e)

the amount of available energy decreases. this can be represented by the size of the boxes as less amount of energy is available for the subsequent trophic levels in a food chain

153.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Thirty-Eighth statement of the video clip?

a)

there are only three to four trophic levels. one important thing to note here is that that the flow of energy is unidirectional which means energy once taken can not be reverted back

b)

for example the solar energy which is taken up by the plants does not go back to the Sun and similarly when the herbivores take the energy from the plant it does not go back to the plants

c)

so in this video we have seen what is trophic levels and how energy flows between them

d)

in the next video we are going to see the food web and the

biological magnification

e)

the amount of available energy decreases. this can be represented by the size of the boxes as less amount of energy is available for the subsequent trophic levels in a food chain

154.

Food Chains: Trophic levels and energy flow in an ecosystem. What is the Thirty-Ninth statement of the video clip?

a)

there are only three to four trophic levels. one important thing to note here is that that the flow of energy is unidirectional which means energy once taken can not be reverted back

b)

for example the solar energy which is taken up by the plants does not go back to the Sun and similarly when the herbivores take the energy from the plant it does not go back to the plants

c)

so in this video we have seen what is trophic levels and how energy flows between them

d)

in the next video we are going to see the food web and the

biological magnification

e)

the amount of available energy decreases. this can be represented by the size of the boxes as less amount of energy is available for the subsequent trophic levels in a food chain