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WorksheetsScience 7 LT 3 Revision A
Total questions: 90
Worksheet time: 1hrs 8mins
This is also called a single cell.
unicellular
multicellular
This is known as the most complex cell.
unicellular
multicellular
1.Which term is defined as the basic building blocks from which all living organisms are made?
A. chromosomes
B. cells
C. plants
D. cancer
3.What protects and controls what moves in and out of the cell?
A. nucleus
B. cell membrane
C. cytoplasm
D. DNA
12.This picture is of a plant cell. What does line labeled #2 represent?
A. cytoplasm
B. nucleus
C. chloroplasts
D. cell membrane
E. cell wall
13.This picture is of a plant cell. What does line labeled #3 (outer layer) represent?
A. cytoplasm
B. nucleus
C. chloroplasts
D. cell membrane
E. cell wall
14.This picture is of a plant cell. What does line labeled #4 represent?
A. cytoplasm
B. nucleus
C. chloroplasts
D. cell membrane
E. cell wall
15.This picture is of a plant cell. What does line labeled #5 represent?
A. cytoplasm
B. nucleus
C. chloroplasts
D. cell membrane
E. cell wall
11.This picture is of a plant cell. What does line labeled #1 (inside layer) represent?
A. cytoplasm
B. nucleus
C. chloroplasts
D. cell membrane
E. cell wall
Which statement of levels of organization from simplest to most complex?
cells, tissue, organs, organ system, organisms
organisms, organ system, organs, tissue, cells
organ, cells, tissue, organ system, organisms
tissue, cells, organ system, organism, organ
Makes energy for the cell
Cytoplasm
Nucleus
Mitochondria
Ribosome
Genetic material is located here
Mitochondria
Vacuole
Nucleus
Cytoplasm
The primary function of the chloroplast is to
convert food into energy a cell can use
control the functions of a cell and control genetic traits
convert radiant energy into chemical energy through photosynthesis
store water and nutrients
What kind of cell is this?
plant
animal
What kind of cell is this?
plant
animal
which of the following best describes an organ?
a group of cells that work together to perform a specific job.
a group of tissues that belong to different system.
a group of tissue that work together to perform a specific job.
a body structure, such as muscle or lungs.
In eukaryotic cells, which organelle contain DNA?
Nucleus
Golgi complex
Smooth ER
Vacuole
This Organelle is __________
Animal cell
Mitochondria
Chlorophyll
Chloroplast
What causes dough to rise when yeast is added into it?
Carbon dioxide is released
Temperature of the dough increase
Amount of dough increase
mount of yeast particle increase
Diagram shows the food for a teenager at tea time.
Which of the following microorganisms is used to produce the food?
Yeast
Virus
Bacteria
Protozoa
Diagram shows two types of food.
Which of the following microorganisms is used to produce the food?
Yeast
Virus
Bacteria
Protozoa
Which microorganism can be used to make a vaccine?
Bacteria
Virus
Protozoa
Algae
Karen wants to make a soft bread for her daughter for breakfast.
Which microorganism is used?
Bacteria
Mucor
Protozoa
Yeast
Chemicals produced by bacteria and fungi, and which treat infections caused by bacteria, are known as ...
serum
medicine
antibiotic
vaccine
Bacteria is known as__________________ in an ecosystem when feeding on dead organisms.
Decomposers
Herbivore
Pathogens
Infections
Penicillium is a
Algae
Fungus
Bacteria
Yeast
Which of the following reproduces only inside a host cell?
Bacteria
Amoeba
Virus
Fungus
Mould likes to grow in warm and ________ places.
dark
moist
bright
Fungi and bacteria obtain food by _______________.
making their on food
feeding on other living things, dead or alive
moving from place to place, looking for food.
Complete the word equation for neuralisation reaction.
Acid + Alkali --> _______ + _________
sugar.....water
salt......water
salt......vinegar
vinegar.....salt
Why is toothpaste alkaline?
It can neutralise strong alkaline in
your mouth
It can neutralise acid in
your mouth
It can refresh your teeth
Toothpaste is not alkaline.
What is the volume of hydrochloric acid required to neutralise 25 ml of sodium hydroxide solution?
15 ml
25 ml
30 ml
50 ml
Conditioners contain ........................ that neutralise alkaline shampoo on hairs.
acid
alkali
Sodium hydroxide
Excess acids in stomach can be neutralized using ............
antacid
vinegar
Orange juice
What is the process that takes place when an acid reacts with an alkali?
Titration
Neutralisation
Chemical reaction
What is the product of a neutralisation reaction?
Acid and alkali
Salt and water
Hydrogen and oxygen
When you place blue litmus paper into an unknown clear solution, the blue litmus paper turns red.
Which of the following represents the most logical conclusion?
The substance has a pH value of "2".
The substance is a base.
The substance has a pH value of "7".
The substance is acidic.
Fabric softener is ...... and help to reduce pH of cloth after being washed with detergent
Acidic
Alkaline
Example of acids
Vinegar
Limewater
Toothpaste
Detergent
An alkaline material will have a pH of
<7
>7
=7
An acidic material will have a pH of
<7
>7
=7
A neutral material will have a pH of
<7
>7
=7
If a material has more OH- ions, then it is a(n)
Acid
Alkaline
Neutral
If a material has an equal amount of H+ and OH- ions, then it is a(n)
Acid
Alkaline
Neutral
If a material has more H+ ions, then it is a(n)
Acid
Alkaline
Neutral
Here is the results of a pH test of vinegar. Is this substance acidic, alkaline, or neutral?
Acidic
Alkaline
Neutral
Here are the pH results of hand soap. Is this substance acidic, alkaline or neutral?
Acidic
Alkaline
Neutral
Bee venom contains acids and other compounds that causes pain and itching when stung. Calamine, lotion a mild base, helps to relieve these symptoms. Which best explains why it does that?
Calamine Lotion hydrates the skin around the bee sting.
Calamine Lotion neutralizes the acids of the bee venom.
Calamine Lotion decreases the pH of the bee venom.
Calamine Lotion repairs the damaged cells like a super hero!
In an experiment some pupils found that baking soda had a pH of about 9.
Some people claim this substance can be used to treat bee stings. Bee stings must be ___________.
acidic
alkaline
neutral
life threatening
The study of the universe beyond the earth?
geology
meteorology
astronomy
oceanography
The Sun appears to travel from ... to ...
West - East
North - South
East - West
South - North
What is an orbit?
A retangular path of a satellite/planet around an object.
A elliptical path of a satellite/planet around an object.
A square path of a satellite/planet around an object.
A triangular path of a satellite/planet around an object.
The halfway between the North and South Poles is called the ...
longitude
equator
axis
latitude
The Earth stands ... position in the Solar system (from the Sun).
1st
2nd
3rd
4th
Which is the rocky planet?
Neptune
Saturn
Venus
Uranus
How many planets are there in the Solar system?
7
9
6
8
The Moon is a ...
star
satellite
planet
meteorite
The person explores the space we call ...
astronomer
engineer
flight attendant
doctor
The day time is pointed by the Earth labelled at ...
A
B
C
The Earth located at B is having ...
sunrise
sunset
night
The Earth located at B is having ...
sunrise
sunset
night
The Earth at E is having ...
sunrise
sunset
One full Earth rotation takes place for ...
366 days
24 hours
30 days
1 year
The imaginary lines drawn through the North and South poles of the Earth is called…
axis
orbits
space
galaxy
the picture shows... of the Earth
revolution
rotation
Earth need … to complete orbitting the sun.
365 days
24 hours
360 days
1 day
The closest star to the earth is…
star
commet
sun
asteroids
Planets that have longest time to orbit the sun is…
neptune
saturn
uranus
mercury
An irregular shaped rocks that smaller than the planets and can found between Mars and Jupiter is…
meteor
comets
asteroid
UFO
Object of space that burn brightly as they enter the Earth’s atmosphere is…
collection of star systems, such as the Solar System, gas, and dust us...
universe
galaxies
andromeda
milky way
Place where the astronauts and scientist from various countries take turns to live and work there is ...
International Station
Space Station
International Space Station
International Galaxies
Vehicles that explore the surface of a planet is...
What is gravity?
A push or pull on an object
The force of attraction (pull) between two objects
The tendency to keep moving in a straight line
Any object that orbits another object
What is caused by the tilt of Earth's axis?
Months
Years
Seasons
Hours
Why do stars appear to move across Earth's sky each night?
Earth rotates on its axis
The stars orbit each other
Earth revolves around the Sun
The stars rotate with the Moon
Why does the moon appear to shine?
It is like a star and gives off light
It refracts light from space
It reflects light from the sun
It absorbs light from the sun
