Grade 4

“Science revision sheet “

Solar system
True or false
_______________ 1. The solar system consists only of the Sun and planets
_______________ 2. The Moon is considered a satellite.
_______________ 3. Gravity is a force that pushes planets away from the Sun.
_______________ 4. The four closest planets to the Sun are gas giants.
_______________ 5. Venus has an atmosphere made mostly of oxygen.
_______________ 6. Mars has active volcanoes.
_______________ 7. Saturn’s rings are made of ice and rock.
_______________ 8. A meteorite is a meteor that reaches Earth’s surface.
_______________ 9. Comets are made mostly of gas and fire.
_______________ 10. Neptune takes 165 Earth years to orbit the Sun.

Choose the correct answer

1. What makes up the solar system?
a) Only the Sun
b) The Sun and all objects in orbit around it
c) Only the planets
d) Only the moons
2. What is a satellite?
a) A planet that moves around the Sun
b) A round object in space
c) Any object that orbits another body
d) A spacecraft sent to explore space
3. What force keeps the planets in orbit around the Sun?
a) Electromagnetic force
b) Gravity
c) Nuclear force
d) Magnetism
4. What tool helps scientists see faraway objects in space?
a) Microscope
b) Periscope
c) Telescope
d) Radar
5. Who discovered objects in space that no one had seen before using a telescope?
a) Isaac Newton
b) Albert Einstein
c) Galileo
d) Neil Armstrong
6. What organization launched rockets to send people into space?
a) ESA
b) NASA
c) SpaceX
d) ISRO
7. What are space shuttles used for?
a) Only space tourism
b) Launching satellites and conducting experiments
c) Traveling to other galaxies
d) Creating artificial gravity
8. What is a probe?
a) A spacecraft that orbits Earth
b) A manned spacecraft
c) An unmanned spacecraft that leaves Earth's orbit
d) A type of space telescope
9. Which is the closest planet to the Sun?
a) Earth
b) Venus
c) Mercury
d) Mars
10 .Which planet has a thick atmosphere made mostly of carbon dioxide?
a) Earth
b) Jupiter
c) Mars
d) Venus
11.What makes Earth unique in our solar system?
a) It is the hottest planet
b) It has oxygen and liquid water
c) It is the largest planet
d) It has the most moons
12. Which planet has volcanoes that are no longer active?
a) Mars
b) Venus
c) Mercury
d) Saturn
13. What are the four planets closest to the Sun called?
a) Gas giants
b) Rocky planets
c) Dwarf planets
d) Ice planets
14. What is Jupiter known for?
a) Being the hottest planet
b) Being the smallest planet
c) Being the largest planet in the solar system
d) Having no moons
15. What makes Saturn famous?
a) Its thick atmosphere
b) Its rings made of ice and rock
c) Its active volcanoes
d) Its strong magnetic field
16. What are the planets beyond Mars called?
a) Rocky planets
b) Ice planets
c) Gas giants
d) Comets
17. What is Uranus' unusual color caused by?
a) Liquid water
b) Gases in its upper atmosphere
c) Volcanic activity
d) Its distance from the Sun
18. How long does Neptune take to complete one orbit around the Sun?
a) 100 Earth years
b) 200 Earth years
c) 165 Earth years
d) 50 Earth years
19. What are comets mostly made of?
a) Iron and rock
b) Ice mixed with rocks and dust
c) Gases and water
d) Molten lava
20. What happens when a comet nears the Sun?
a) It freezes
b) It moves away from the Sun
c) It heats up and forms a tail of gas
d) It loses its orbit
21. What are large chunks of rock or metal in space called?
a) Meteors
b) Asteroids
c) Comets
d) Moons
22. Where do most asteroids in our solar system lie?
a) Between Earth and Mars
b) Between Mars and Jupiter
c) Beyond Neptune
d) Near the Sun
23. What is a meteoroid?
a) A large planet
b) A comet’s tail
c) A small piece of rock or metal in space
d) A man-made satellite
24. What is a meteor?
a) A meteoroid that enters Earth’s atmosphere
b) A comet's core
c) A rock from Saturn’s rings
d) A star
25. What happens to most small meteors when they enter Earth’s atmosphere?
a) They turn into satellites
b) They break apart into new planets
c) They burn up, leaving streaks of light
d) They explode
26. What is a meteorite?
a) A meteor that burns up
b) A meteor that reaches Earth's surface
c) A new planet
d) A type of star
27. What are the gas giants mostly made of?
a) Water
b) Rock and metal
c) Hydrogen and helium
d) Carbon dioxide
28. Which planet is known for rotating on its side?
a) Neptune
b) Jupiter
c) Uranus
d) Mars
29 . How many moons has Jupiter been observed to have?
a) 10
b) 25
c) 50
d) At least 63
30. Which planet is the farthest gas giant from the Sun?
a) Saturn
b) Uranus
c) Neptune
d) Jupiter
Lunar cycle
True or false
_______________ 1. The moon has phases because it moves around the Earth.
_______________ 2. The same side of the moon always faces Earth.
_______________ 3. A waxing moon is getting smaller.
_______________ 4. A lunar eclipse happens when the Sun blocks the moon.
_______________ 5. The moon is bigger than the Earth.
_______________ 6. The moon takes about 29.5 days to complete a cycle.
_______________ 7. A full moon means the moon is completely lit.
_______________ 8. The moon does not affect the ocean tides.
_______________ 9. A new moon is visible at night.
_______________ 10. The moon does not have gravity.
_______________ 11. A crescent moon is larger than a gibbous moon.
_______________ 12. The phases of the moon happen in a repeating cycle.
_______________ 13. The moon's light comes from the sun.
_______________ 14. The last quarter moon is also called the third quarter moon.
_______________ 15. The moon appears to change shape, but it does not really change.

Choose the correct answer

1. What is the first phase of the moon?
a) Full Moon
b) New Moon
c) First Quarter
d) Last Quarter
2. What causes the moon to appear to change shape?
a) Clouds covering the moon
b) The Earth's rotation
c) The way sunlight reflects on the moon
d) The moon changing size
3. What is the phase called when the moon is getting bigger?
a) Waxing
b) Waning
c) Full Moon
d) Eclipse
4. What is the phase called when the moon is getting smaller?
a) Waxing
b) Waning
c) New Moon
d) Gibbous
5. A crescent moon looks like:
a) A full circle
b) A banana shape
c) A straight line
d) A triangle
6. When half of the moon is lit on the right side, what phase is it in?
a) First Quarter
b) Last Quarter
c) Full Moon
d) New Moon
7. What phase comes after the Full Moon?
a) New Moon
b) First Quarter
c) Waning Gibbous
d) Waxing Crescent
8. What phase comes before the New Moon?
a) First Quarter
b) Waxing Crescent
c) Waning Crescent
d) Full Moon
9. What is the term for the time it takes for the moon to complete all its phases?
a) One week
b) One day
c) One month
d) One year
10. Which moon phase happens when we can’t see the moon at all?
a) Full Moon
b) New Moon
c) Waxing Gibbous
d) Waning Crescent
11. What does 'gibbous' mean?
a) More than half full
b) Less than half full
c) A thin sliver of light
d) No moon visible
12. The moon is always moving around:
a) The Sun
b) The Earth
c) Mars
d) Other stars
13. How long does it take for the moon to go through all of its phases?
a) 7 days
b) 14 days
c) 29.5 days
d) 365 days
14. What is a waxing crescent moon?
a) A moon getting smaller
b) A moon getting bigger
c) A full moon
d) A lunar eclipse
15. What phase is the moon in when it is between the Sun and Earth?
a) Full Moon
b) New Moon
c) First Quarter
d) Last Quarter
16. What does 'waning' mean?
a) Getting bigger
b) Staying the same
c) Getting smaller
d) Changing color
17. Which phase comes after the first quarter?
a) Waxing Crescent
b) Full Moon
c) Waning Gibbous
d) Waning Crescent
18. How many days does it take for the moon to go from New Moon to Full Moon?
a) About 7 days
b) About 14 days
c) About 21 days
d) About 30 days
19. What phase is after the waxing gibbous?
a) Full Moon
b) Waning Gibbous
c) First Quarter
d) Waxing Crescent
20. How does the moon produce light?
a) It generates its own light
b) It reflects sunlight
c) It uses solar panels
d) It burns gas
21. What causes moon phases?
a) Earth's shadow
b) The Sun's movement
c) The Moon's orbit around Earth
d) The rotation of the Sun
22. What does a waning crescent moon look like?
a) A full circle
b) A banana shape
c) A half-moon
d) A bright star
23. What happens after the waning crescent?
a) New Moon
b) Waxing Gibbous
c) Full Moon
d) First Quarter
24. The phases of the moon repeat every...
a) Year
b) Week
c) Month
d) Day
25. The dark side of the moon is...
a) Always dark
b) Never dark
c) Sometimes dark
d) A myth

Internal and external structures and function of plants

True or false
_______________ 1. Flowers primarily function to enable plant reproduction.

_______________ 2. The stem is the external structure of a plant that helps limit water loss.

_______________ 3. Stomata in plant leaves allow air to enter the plant.

_______________ 4. Sepals in a flower serve to attract pollinators.

_______________ 5. The anther is responsible for producing pollen in a flower.

_______________ 6. Petals in a flower protect the ovary rather than attract pollinators.

_______________ 7. The sticky or feathery surface of the pistil is called the stigma.

_______________ 8. The filament connects the stigma to the ovary in a flower.

_______________ 9. The filament in a flower functions to support and elevate the anther.

_______________ 10. The primary function of the cuticle on a plant leaf is to limit water loss.

Choose the correct answer

1. What is the primary function of flowers in plants?

a) To store water
b) To enable plant reproduction
c) To protect the plant from predators
2. Which external structure of a plant helps limit water loss?

a) Roots
b) Stem
c) Cuticle

3. What is the function of the stomata in plant leaves?

a) To store water
b) To allow air to enter the plant
c) To produce pollen

4. What is the role of sepals in a flower?

a) To attract pollinators
b) To produce pollen
c) To protect the developing flower bud

5. Which part of the flower is responsible for producing pollen?

a) Stigma
b) Anther
c) Style

6. What is the function of petals in a flower?

a) To produce seeds
b) To attract pollinators
c) To protect the ovary

7. What is the sticky or feathery surface of the pistil called?

a) Stigma
b) Style
c) Ovary

8. Which part of the pistil connects the stigma to the ovary?

a) Anther
b) Filament
c) Style
9. What is the role of the filament in a flower?

a) To produce pollen
b) To support and elevate the anther
c) To attract pollinators

10. What is the primary function of the cuticle on a plant leaf?

a) To absorb sunlight
b) To limit water loss
c) To produce pollen

11. Which part of the plant makes seeds?

a) Flowers
b) Roots
c) Stems
12. What are the tubes that carry water?
a) Xylem
b) Phloem
c) Stomata
13. Green leaf-like structure that protect a flower is called
a) Sepal
b) Stamen
c) Ovary
14. A waxy outer coating on a leaf that helps a plant store water and control the amount of
water that leaves the plant before it blooms is called.

a) Pistil
b) Cuticle
c) Stamen
15. What are plant veins made of?

a) Xylem and phloem

b) Roots and leaves
c) Flowers and seeds
Internal and external structures and function of animals
True or false
_______________ 1. The heart is the organ responsible for moving blood to and from different
areas of the body.

_______________ 2. The lungs are the main respiratory organs that take in and release air.

_______________ 3. An endoskeleton is a hard covering on invertebrates used to maintain

their shape and protect their organs.

_______________ 4. Gills are the organ in fish and young amphibians that take in oxygen from
water.

_______________ 5. The brain receives information from sense organs and tells the body how
to react.

_______________ 6. The cerebellum is the thinking part of the brain.

_______________ 7. The brain stem controls how many internal structures function.

_______________ 8. The brain stem is responsible for controlling many internal functions in the
body.

_______________ 9. The cerebrum is the part of the brain responsible for balance and
coordination.

_______________ 10. The lungs help circulate blood throughout the body.

_______________ 11. Gills are the respiratory organs found in mammals.

_______________ 12. The exoskeleton is an internal structure that supports vertebrates.

_______________ 13. The heart is responsible for pumping oxygen-rich blood throughout the
body.

_______________ 14. The cerebellum is responsible for controlling movement and balance.

_______________ 15. The brain stem is mainly responsible for thinking and problem-solving.
Choose the correct answer
1. An organ that moves blood to and from different areas of the body is

a) brain
b) lungs
c) heart

2. The main respiratory organ that takes in and releases air is.

a) gills
b) lungs
c) brain

3. A hard covering on invertebrates used to maintain their shape and protect their organs is
called.

a) Exoskeleton
b) Endoskeleton
c) Characteristics

4. ……………………………………………………………… is the organ in fish and young amphibians that

takes in oxygen from water.

a) Gills
b) Lungs
c) Brain

5. An organ that receives information from sense organs about the environment and then
tells the body how to react.

a) lungs
b) heart
c) brain

6. ……………………………………………………………… is the thinking part of the brain

a) Cerebrum
b) Cerebellum
c) Brain stem

7. ……………………………………………………………… controls how many internal structures functions

a) Cerebrum
b) Cerebellum
c) Brain stem