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Year 8 Science Exam Revision

Total questions: 143

Worksheet time: 3hrs 35mins

Name
Class
Date
1.

The cell theory applies to all organisms, including the five shown. Which of the following statements describes how these organisms are an example of the cell theory?

a)

The organisms have cells that lack a nucleus.

b)

The organisms are made of one or more cells.

c)

The cells of the organisms undergo photosynthesis.

d)

The cells of the organisms are identical to each other.

2.
Which invention from the 17th century allowed for the development of modern cell theory?
a)

x-rays

b)

computers

c)

the light microscope

d)

the scanning electron microscope

3.

The cell theory developed from the work of many different scientists. Which of the following statements is NOT part of the cell theory?

a)

All cells come from other living cells.

b)

The cell is the basic unit of all living things.

c)

All cells of living things have the same organelles.

d)

All living things are made up of one or more cells.

4.

There are three tenets of the Cell Theory. Which of the following is NOT a tenet?

a)

Cells are the basic structure and function of life.

b)

All living things are made of one or more cells.

c)

The cell is the basic unit of matter.

d)

All cells come from preexisting cells.

5.

Cells that are only made of (a)   cell are called unicellular.

6.

Which of the following statements is true?

a)

Plants and animal cells have cell walls for protection.

b)

Animal cells have one large vacuole; the plant cell has tiny ones.

c)

Plant cells contain chlorophyll; animal cells have lysosomes.

d)

Animal cells are box shaped; plant cells are circular.

7.

Which picture does NOT belong?

a)
b)
c)
8.

Bacteria is classified as a what?

a)

Prokaryote

b)

Eukaryote

9.
The ___ is the basic unit of sturucture and function of organisms
a)
atom
b)
cell
c)
matter
d)
all other answers are correct
10.
Which statement is a part of the cell theory?
a)
all cells come from preexisting cells
b)
bacteria are prokaryotic cells
c)
eukaryotic cells are complex
d)
humans are multicellular
11.
The Cell Theory states...
a)
atoms create all matter
b)
living things evolve
c)
the cell is the backbone of all matter
d)
cells are the basic unit of structure and organization of organisms
12.

Choose 3:

What are the three main differences in plant and animal cells?

a)

Cell Wall

b)

Mitochondria

c)

Chloroplast

d)

Larger Vacuole

e)

Cell Membrane

13.
I am only found in a plant cell. What am I?
a)
cell wall
b)
mitochondria
c)
cytoplasm
d)
chloroplast
14.

Which organelle produces proteins?

a)

Ribosomes

b)

Lysosomes

c)

Nucleus

d)

Vacuoles

15.

Which cell parts are not present in animal cells?

a)

cell membrane & cytoplasm

b)

nucleus & chloroplasts

c)

cell wall & chloroplasts

d)

ribosomes & mitochondria

16.

Which organelle is the location of DNA (genetic material)?

a)

mitochondria

b)

ribosomes

c)

nucleus

d)

Endoplasmic Reticulum

17.
You might think of me as the trash collector, but recycler is maybe more accurate. What am I?
a)
cytoplasm
b)
lysosome
c)
vacuole
d)
ribosome
18.
What is the name of the genetic material that is inside the nucleus?
a)
ER
b)
ATP
c)
YOLO
d)
DNA
19.
I store water in both plant and animal cells. What am I?
a)
cytoplasm
b)
ribosomes
c)
vacuole
d)
lysosomes
20.
This organelle takes food and turns it into ENERGY for plant and animal cells.
a)
Chloroplast
b)
Mitochondria
c)
Lysosome
d)
Ribosome
21.
I am a protein packaging and shipping machine! Who am I?
a)
vacuole
b)
ribosome
c)
endoplasmic reticulum
d)
golgi apparatus
22.
Which organelle is only found in a plant cell? 
a)
nucleus
b)
chloroplast
c)
mitochondria
d)
cell membrane
23.
"Post office" of the cell that packages proteins and fats: 
a)
Rough ER
b)
Smooth ER
c)
Golgi Apparatus
d)
Lysosome
24.
The watery liquid that fills the cell: 
a)
Chromatin
b)
Nucleolus
c)
Cytoplasm
d)
Cell Membrane
25.

What is the cell membrane's function (job)?

a)

Gives the plant cell its shape, structure, and support

b)

Controls what enters and leaves the cell like security at the airport

c)

jelly-like substance that holds the organelles in place

26.

What is the cell wall's function (job)?

a)

give the plant cell its structure, shape, and support

b)

Powerhouse of the cell that gives the cell energy to use

c)

controls what enters and leaves the cell

27.

The solution surrounding the cell in Diagram B, would be defined as:

a)

hypertonic

b)

hypotonic

c)

isotonic

28.

The solution surrounding the cell in Diagram C, would be defined as

a)

hypertonic

b)

isotonic

c)

hypotonic

29.
The cell below is in a _________ solution.
a)
Hypotonic
b)
Hypertonic
c)
Isotonic
30.
The cell below is in a _____________ solution.
a)
Hypertonic
b)
Hypotonic
c)
Isotonic
31.
What type of solution is this cell in?
a)
Isotonic
b)
Hypertonic
c)
Hypotonic
d)
diffused
32.

What will happen to the cell in the given solution?

a)

Swell up

b)

Shrink

c)

Stay the same

33.
What type of solution allows water to enter the plant cell?
a)
hypotonic solution
b)
hypertonic solution
c)
isotonic solution
d)
active transport
34.
The cells seem to be shriveled and dehydrated what type of solution are they most likely in?
a)
Hypertonic
b)
Isotonic
c)
Hypotonic
35.

Movement of SOLUTE through the cell membrane from high to low concentration is called.....

a)

diffusion

b)

active transport

c)

facilitated diffusion

d)

osmosis

36.

Which molecule is in equilibrium? How can you tell?

a)

Molecule A; equal amounts inside and outside

b)

Molecule B; passive movement into the cell

c)

Molecule C; equal amounts inside and outside

d)

Molecule C; all molecules are inside the cell

37.
How does a cell maintain homeostasis?
a)
Regulates what enters and leaves the cell
b)
Flexibility
c)
Protective barrier
d)
Structure and support
38.

What is the difference between active and passive transport?

a)

Active is high to low; Passive is low to high

b)

Active uses no cell energy; Passive uses cell energy

c)

Passive is high to low and uses no energy; Active uses energy and is low to high

d)

Passive uses no cell energy

39.

Fill in the blank:

Osmosis is the movement of ________ across a cell membrane from high to low.

a)

Carbon dioxide

b)

Starch

c)

Water

d)

Oxygen

40.
An ISOTONIC solution has a(n) ______________ concentration of solute (dissolved stuff) than inside the cell.
a)
lower
b)
equal
c)
higher
41.
The salt in the glass of saltwater is considered the
a)
solvent
b)
solution 
c)
pepper
d)
solute
42.

In an isotonic solution which way will the water flow

a)

it will not flow at all

b)

it will flow into the cell

c)

it will flow both ways at equal rates

d)

out of the cell

43.

A solution outside of a cell that contains a higher water concentration than the cytoplasm of a cell is called:

a)

solution

b)

hypertonic

c)

hypotonic

d)

isotonic

44.

What would happen to a cell placed in a hypertonic solution

a)

The cell would shrink

b)

The cell would expand and possibly burst

c)

The cell would remain the same

d)

The cell would dance and do the Nay Nay!

45.

How do molecules move during diffusion?

a)

From high concentration to low concentration

b)

From low concentration to high concentration

46.
Which statement best describes the cell membrane?
a)
The protective outer layer that controls what enters and leaves the cell.
b)
Stores information on DNA molecules / Directs and controls the activities of the cell.
c)
A folded membrane that moves materials around inside cells / Also acts as the site of manufacturing materials needed by the cell.
d)
The smallest organelle with a huge job / Makes proteins, which are the building blocks of the body.
47.
What is the main function of the respiratory system?
a)
to provide oxygen and remove carbon dioxide from the body
b)
to bring oxygen to the body
c)
to break down food and absorb nutrients
d)
to remove oxygen from the body and deliver carbon dioxide
48.
When you breathe, your lungs take in ___ and remove ___. 
a)
air/oxygen
b)
oxygen/carbon dioxide 
c)
carbon dioxide/waste 
d)
waste/air 
49.
Within the lungs, the exchange of oxygen and carbon dioxide occurs between the ___ and the capillaries. 
a)
trachea 
b)
bronchi 
c)
alveoli
d)
diaphragm
50.

What is the main function of the respiratory system?

a)

to provide oxygen and remove carbon dioxide from the body

b)

to bring oxygen to the body

c)

to break down food and absorb nutrients

d)

to remove oxygen from the body and deliver carbon dioxide

51.
Which of the following are features of the alveoli that adapt them to gas exchange?

I. High surface area
II. Thin walls
III. Dry surfaces
a)
I and II only
b)
I only
c)
II and III
d)
I, II, and III
52.

What type of digestion takes place in the stomach?

a)

mechanical

b)

chemical

c)

both mechanical and chemical

53.

What enzyme is found in saliva that starts digesting carbohydrates?

a)

amylase

b)

chyme

c)

pepsin

d)

bile

54.

Where does the absorption of nutrients from food take place?

a)

stomach

b)

liver

c)

small intestine

d)

large intestine

55.

What part of the digestive system mechanically and chemically breaks down food?

a)

mouth

b)

stomach

c)

both the mouth and stomach

56.

What chemically breaks down food into smaller molecules?

a)

teeth

b)

muscles of the stomach

c)

enzymes

57.

Numerous fingerlike projections in the folds of the wall of the ileum is classified as

a)

Bolus

b)

Chyme

c)

Bile

d)

Villi

58.

The majority of the absorption of nutrients into the bloodstream occurs in the _______.

a)

Stomach

b)

Small intestine

c)

Large intestine

d)

Liver

59.

What increases the surface area of the small intestine?

a)

duodenum

b)

villi

c)

ileum

d)

pancreas

60.

What is the purpose of the villi? (select all that apply)

a)

increase the surface area

b)

chemically break down food

c)

absorb nutrients into the bloodstream

d)

mechanically break down food

61.

Which structures increase the surface of the gut?

a)

Lacteal and villi

b)

Villi and microvilli

c)

Intestinal glands and microvilli

d)

Capillaries and membrane proteins

62.

In reference to the image above, how would the absorption of a person with Celiac disease be affected ?

a)

No effect on absorption.

b)

The villi are flattened and therefore their absorption of nutrients would increase.

c)

The villi are flattened and therefore their absorption of nutrients would decrease.

d)

The villi are enlarged and absorption would increase.

63.

the variable changed by the scientist

a)

independent variable

b)

dependent variable

64.

the variable that might change because of what the scientist changes

a)

independent variable

b)

dependent variable

65.

the result that is measured after the experiment

a)

independent variable`

b)

dependent variable

66.

If I drink too much caffeine before bed, then I won't get much sleep. What is the IV?

a)

drinking caffeine

b)

amount of sleep

67.

If I drink too much caffeine before bed, then I won't get much sleep. What is the DV?

a)

drinking caffeine

b)

amount of sleep

68.
What is the Independent Variable (IV) in the following testable question: Does the temperature of a tennis ball affect the height of its bounce?
a)
the temperature of tennis ball
b)
height of the bounce
69.
What is the Dependent Variable (DV) in the following testable question? Does a metal baseball bat vibrate more than a wooden baseball bat?
a)
the type of baseball bat
b)
the amount of vibration
70.
The variable we measure to get our results the:
a)
Dependent Variable
b)
Independent Variable
c)
Constant
71.
The variable we are changing/investigating in an experiment is the:
a)
Dependent Variable
b)
Independent Variable
c)
Constant
72.
How many variables can be tested in a controlled experiment?
a)
one
b)
two
c)
three
d)
as many as possible
73.
The variables in an experiment that stay the same are the:
a)
IV
b)
DV
c)

controls or constants

74.

What is the purpose of an enzyme?

a)

give permission for the reaction

b)

raise activation energy

c)

speed up reactions (catalyst)

d)

control how many reactions occur

75.
What is being represented by the letter A in the image?
a)
Substrate
b)
Enzyme
c)
Product
d)
Complex
76.
Which biomolecule is also known as enzymes?
a)
Carbohydrate
b)
Lipid
c)
Nucleic Acid
d)
Protein
77.

Letter C, where the reaction take place is called the

a)

active site

b)

enzyme

c)

substrate

d)

products

78.
Enzymes catalyze reactions by ___________ Activation Energy.
a)
Increasing
b)
Decreasing
79.
Based on the graph, what temperature does this enzyme work best? 
a)
15 C
b)
40 C
c)
30 C
d)
47 C
80.
Which of the following conclusions can be drawn from this graph?
a)
The optimum pH of the enzyme is 6.6.
b)
The optimum pH of the enzyme is 5.8
c)
The enzyme’s activity increases as pH increases 5.0 to 9.0
d)
The enzyme’s activity is greater around pH of 8.0 .
81.
The "lock and key hypothesis" attempts to explain the mechanism of?
a)
Vacuole formation
b)
Pinocytosis
c)
Sharing of electrons
d)
Enzyme are specific to a substrate
82.
In the diagram, what is letter A? 
a)
product
b)
substrate
c)
enzyme-substrate complex
d)
active site
83.
Each enzyme only has 1 substrate that will fit its active site.  What is this called?
a)
reusablility
b)
denaturation
c)
specificity
d)
fragility
84.
Any substance that is acted upon by an enzyme is called a(n)?
a)
Coenzyme
b)
Substrate
c)
Vitamin
d)
Polypeptide
85.
What will most likely happen if an appropriate enzyme is added to a chemical reaction? 
a)
The reaction rate will increase.
b)
The equilibrium of the reaction will be maintained. 
c)
The reaction rate will decrease.
d)
The reaction will stop. 
86.
The graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?
a)
Enzymes increase the energy of the reactants.
b)
Enzymes decrease the energy level of the products.
c)
Enzyme decrease the activation energy of the reaction.
d)
Enzymes reverse the direction of the reaction.
87.
What happens when enzymes are heated to a high temperature?
a)
The enzymes die.
b)
The shapes of the enzyme are altered denature
c)
The enzymes' amino acid sequence changes.
d)
The enzymes remain the same
88.

Enzymes in your body probably work best at which of the following temperatures>

a)

25oC

b)

98oC

c)

37oC

d)

210oC

89.
What is the energy needed to start an chemical reaction referred to?
a)
Cascading Energy
b)
Potential Energy 
c)
Kinetic Energy
d)
Activation energy
90.
Enzymes are capable of increasing the rate of a chemical reaction within a living cell.  Enzymes accomplish this through which of the following means?
a)
reducing the number of products   
b)
reducing the activation energy
c)
increasing the temperature of the cell
d)
increasing the concentration of reactants 
91.
What is the name for the mechanism of enzyme activity?
a)
Lock and key
b)
jigsaw puzzle
c)
hammer and nail
d)
two hands pattern
92.
What is another name for enzymes?
a)
chemical catalysts
b)
microorganisms
c)
biological catalysts
d)
inorganic catalysts
93.
How are elements on the periodic table arranged by?
a)
in alphabetic order
b)
simular physical & chemical properties
c)
their symbols
d)
Just simular physical properties
94.
Each column in the periodic table is called a _________ .
a)
period
b)
group
c)
cluster
d)
unit
95.
Two elements chemically bonded form
a)
element
b)
compound
c)
mixture
d)
solutions
96.
Periods on the periodic table are __________.
a)
Horizontal Rows
b)
Vertical Columns
97.

The Atomic number is known as the _______

a)

Number of electrons in an atom

b)

Number of Protons in an atom

c)

Number of neutrons in an atom

d)

Number of Protons and electrons in an atom

98.

What charge do protons have?

a)

Positive

b)

Negative

c)

Neutral

99.

What is Atomic Mass Number ?

a)

Number of Protons

b)

Number of Neutrons

c)

Number of Protons and Neutrons

d)

Number of Protons and Electrons

100.

The number of electrons in an atom is equal to the...

a)

Atomic number

b)

Protons

c)

Atomic Mass

d)

Neutrons

101.

The formula used to calculate the number of neutrons is:

a)

Mass Number - Atomic Number

b)

Protons + Electrons

c)

Atomic Number - Mass Number

d)

Protons x2

102.

Which group does Hydrogen belong to?

a)

Group 1

b)

Group 2

c)

Group 3

d)

Group 4

103.

Which group does Aluminum belong to?

a)

Group 3

b)

Group 13

c)

Group 6

d)

Group 26

104.

Which period is Oxygen found in?

a)

Period 1

b)

Period 2

c)

Period 3

d)

Group 16

105.

Which Period is Gold (Au) found in?

a)

Group 11

b)

Group 6

c)

Period 11

d)

Period 6

106.

Which element is found in Period 4, Group 8?

a)

Iron

b)

Oxygen

c)

Nickel

d)

Silver

107.

Which element is in the SAME GROUP as Oxygen?

a)

Hydrogen

b)

Helium

c)

Sulfur

d)

Carbon

108.

Which element is in the SAME PERIOD as Helium?

a)

Hydrogen

b)

Neon

c)

Nitrogen

d)

Potassium

109.

What is the ATOMIC NUMBER of the element found in Period 4, Group 1?

a)

41

b)

4

c)

1

d)

19

110.

What Group and Period does Chlorine (Cl) belong to?

a)

Group 3, Period 17

b)

Group 2, Period 17

c)

Group 17, Period 3

d)

Group 17, Period 4

111.

These are examples of ruminants:

a)

pigs, horses, humans and chickens

b)

sheep, goats, cattle, deer, giraffes

c)

pigs, sheep, cattle, chickens

d)

pigs, hippos, llamas

112.

Ruminants have ___ complex stomach stuctures

a)

1

b)

2

c)

3

d)

4

113.

What is the plant cell carbohydrate called that cows can digest and humans can't?

a)

carotene

b)

chlorophyl

c)

cellulose

114.
When ruminants "chew the cud", they are
a)
regurgitating food to chew it again
b)
belching to release gas from fermenting food
c)
passing gas! 
d)
regurgitating food they don't want
115.
What is the organ where water is absorbed from the digested food and returned to the bloodstream?
a)
mouth
b)
small intestine 
c)
esophagus
d)
large intestine
116.

Identify the given diagram

a)

lungs

b)

spiracles

c)

gills

d)

none of this

117.

the fish have Lung for respiration

a)

true

b)

false

118.
State True or False
Gills take in oxygen from the water while lungs take in oxygen from the air.
a)
True
b)
False
119.

Gills of a fish are equipped with blood vessels to help in the exchange of gases

a)

True

b)

False

120.

How do plants breathe?

a)

Through the stem

b)

Through the stomata

c)

Through the chloroplast

121.

What is the function (job) of fish gills?

a)

To absorb water from the water

b)

To make the fish faster

c)

To make the fish lighter

d)

To absorb oxygen from the water

122.

Fish breathe using

a)

gills

b)

lungs

c)

antennae

123.

Which results in offspring that are genetically unique and display a combination of traits from each parent?

a)

Sexual

b)

Asexual

c)

Neither

d)

Both

124.

Which type of reproduction results in offspring that are identical to the parent?

a)

Sexual

b)

Asexual

c)

Neither

d)

Both

125.

Which type of reproduction tends to produce more offspring?

a)

Sexual

b)

Asexual

c)

They occur at the same rate

126.
What is the electron configuration of sodium?
a)
2.8
b)
2.8.2
c)
2.8.1
d)
11
127.
What is the electron configuration of calcium?
a)
2.8.8.2
b)
2.8.10
c)
20
d)
2.18.2
128.
Which element has an electron configuration of 2.5?
a)
Oxygen
b)
Nitrogen
c)
Phosphorus
d)
Carbon
129.
Which element has an electron configuration of 2.8.8?
a)
Lead
b)
Flourine
c)
Neon
d)
Argon
130.
What is the electron configuration of Aluminium?
a)
2.8.3
b)
2.11
c)
13
d)
2.8.2
131.
Which element has the electron configuration of 2.8.4?
a)
Neon
b)
Boron
c)
Gallium
d)
Silicon
132.
Which element has the electron configuration of 2.8.2?
a)
Magnesium
b)
Sodium
c)
Sulfur
d)
Arsenic
133.

What type of asexual reproduction is it?

a)

budding

b)

vegetative propagation

c)

sporulation

d)

binary fission

134.

What type of asexual reproduction is it?

a)

vegetative propagation

b)

sporulation

c)

budding

d)

binary fission

135.

What type of asexual reproduction is it?

a)

vegetative propagation

b)

sporulation

c)

budding

d)

binary fission

136.

Which organism would you classify as sexually reproducing?

a)

A strawberry plant that reproduces through runners in the ground

b)

A starfish that reproduces by breaking off and regenerating parts of its body

c)

An amoeba that splits through binary fission

d)

A chicken egg that is fertilized by a rooster

137.
In an exothermic reaction, heat is ...
a)
taken in or absorbed
b)
given out or released
138.
In an endothermic reaction, heat is ...
a)
taken in or absorbed
b)
given out or released 
139.
What type of reaction occurs in a hand warmer
a)
exothermic
b)
endothermic
140.
Is photosynthesis an exothermic or endothermic reaction?
a)
Endothermic
b)
Exothermic
c)
Neither
141.
Alka-seltzer in water is an example of a 
a)
Endothermic reaction
b)
Exothermic reaction
c)
Dissolving a salt
d)
physical change 
142.
A catalyst works by
a)
changing the order of the reaction
b)
increasing the temperature
c)
lowering the activation energy
d)
making the activated complex
143.

Which of these is an adaptation alveoli have for efficient gas exchange?

a)

thick walls

b)

thin walls

c)

small surface area

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Worksheet 1: Characteristics of Living Things and Life Functions

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Worksheet 1: Characteristics of Living Things and Life Functions

quiz

Worksheet

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8th Grade