Grade 3 Science Exam Worksheet for 9-Year-Olds — 40 Questions (15 Objective, 25 Subjective) | Living Things, Plants, Animals & Human Organs

Instructions

Read each question carefully. Answer all questions to the best of your ability. For drawing questions, do your best to draw clearly in the space provided.

Part A: Objective Questions

Section 1: Multiple Choice

Circle the correct answer for each question.

1. What do plants use to make their own food in their leaves?
• A) Moonlight, water, and soil
• B) Sunlight, water, and carbon dioxide
• C) Sugar, water, and oxygen
• D) Soil, air, and flowers
2. Which of these animals is a carnivore?
• A) Cow
• B) Rabbit
• C) Lion
• D) Deer
3. Which part of a plant absorbs water and nutrients from the soil?
• A) Flower
• B) Leaf
• C) Stem
• D) Roots
4. Which human organ is responsible for pumping blood all around the body?
• A) Brain
• B) Lungs
• C) Heart
• D) Stomach
5. What is the correct order for a butterfly's life cycle?
• A) Pupa, Egg, Larva, Adult
• B) Egg, Larva, Pupa, Adult
• C) Larva, Egg, Adult, Pupa
• D) Egg, Pupa, Larva, Adult

Section 2: Fill in the Blanks

Complete each sentence with the correct word.

6. Living things need __________________, water, and food to survive.
7. An animal that eats both plants and other animals is called an __________________.
8. The __________________ is the control center of the human body, telling all other parts what to do.
9. A food chain always starts with a plant, which is called a __________________.
10. The process of a seed starting to grow into a new plant is called __________________.

Section 3: True or False

Write 'True' or 'False' next to each statement.

11. A rock is a living thing. _______________
12. All animals give birth to live young. _______________
13. Leaves are often called the "kitchen" of the plant because they make food. _______________
14. Humans breathe in oxygen and breathe out carbon dioxide. _______________
15. A bear that eats fish and berries is a herbivore. _______________

Part B: Subjective Questions

Section 4: Short Answer Questions

Write your answer in the space provided.

16. Name two things that all living things do.

__________________________________________________________________

17. What is the main job of the human stomach?

__________________________________________________________________

18. Why are roots important for a plant? Give two reasons.

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19. Give one example for each of the following:
    A living thing: __________________
    A non-living thing: __________________
    A thing that has never lived: __________________
20. What is a food chain?

__________________________________________________________________

21. Name the four stages of a frog's life cycle in order.

__________________________________________________________________

22. What would happen to a plant if it did not get any sunlight?

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23. What is the difference between a herbivore and a carnivore?

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24. Name two organs found inside the human chest.

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25. How do most flowering plants create new plants?

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Section 5: Diagrams and Labeling

Follow the instructions for each question.

26. Draw a simple flowering plant and label these four parts: roots, stem, leaf, and flower.









27. Look at the food chain below. Label the Producer, the Primary Consumer, and the Secondary Consumer.
    Grass → Rabbit → Fox
    ____________ ____________ ____________


28. Draw the life cycle of a butterfly in the correct order. Label the four stages: egg, larva (caterpillar), pupa (chrysalis), and adult butterfly.









29. The simple shape below represents a person's upper body. Draw a simple heart on the left side of the chest and two lungs on either side.

      ( )
     / | \
    |     |
    |     |
     \___/ 
    



30. Label the parts of this diagram with the words: Sun, Producer, Consumer.



[ Energy Source ] → [ Makes its own food ] → [ Eats other things ]

____________ __________________ _________________

Section 6: Problem Solving

Think carefully and write your answer.

31. You see a cat run away when you clap your hands loudly. Which characteristic of a living thing is the cat showing?

__________________________________________________________________

32. A farmer wants her crops to grow healthy and strong. List three things she must make sure the plants have.

__________________________________________________________________

33. In a field, foxes eat rabbits and rabbits eat grass. If a disease killed all the grass, what would happen to the rabbits? What might then happen to the foxes?

__________________________________________________________________

34. You have three objects: a pencil, a seed, and a toy car. Sort them into the groups below. Explain why the seed is in its group.
    Living: __________________
    Non-living: __________________
    Never Lived: __________________
    Explanation for the seed: __________________________________________________________________
35. A lion eats a zebra, and the zebra eats grass. Who is the herbivore in this food chain? Who is the producer?

__________________________________________________________________

36. Why can't a human breathe underwater like a fish can?

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37. Imagine you have a pet hamster. List four things you must provide to keep it alive and healthy.

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38. A houseplant's leaves are turning yellow and drooping. What are two possible reasons for this?

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39. Your friend says a computer is a living thing because it uses energy (electricity) and responds when you type on the keyboard. Explain why your friend is wrong, using what you know about living things.

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40. Create a simple food chain using three living things you might find in a garden.

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Answer Key

Part A: Objective Questions

1. B) Sunlight, water, and carbon dioxide
2. C) Lion
3. D) Roots
4. C) Heart
5. B) Egg, Larva, Pupa, Adult
6. Air / Oxygen
7. Omnivore
8. Brain
9. Producer
10. Germination
11. False
12. False
13. True
14. True
15. False

Part B: Subjective Questions

(Note: Some answers may vary slightly but should reflect the same core concept.)

16. (Any two) They grow, breathe, move, reproduce, need food/water, respond to their environment.
17. Its main job is to break down and digest food.
18. 1. They anchor the plant in the ground. 2. They absorb water and nutrients from the soil.
19. Living: tree/dog/person. Non-living: chair/table/pencil. Never Lived: plastic/glass/rock. (Examples will vary).
20. A food chain shows how energy is passed from one living thing to another (e.g., from a plant to an animal that eats it).
21. Egg, Tadpole, Froglet, Adult Frog.
22. It would not be able to make its own food (photosynthesis) and it would die.
23. A herbivore eats only plants. A carnivore eats only other animals (meat).
24. Heart and Lungs.
25. They produce seeds (usually in the flower/fruit) which can grow into new plants.
26. (Drawing should clearly show the four parts correctly labeled.)
27. Grass: Producer; Rabbit: Primary Consumer; Fox: Secondary Consumer.
28. (Drawing should show the four stages in a cycle: egg on a leaf → caterpillar → chrysalis/pupa hanging → butterfly.)
29. (Drawing should show a heart shape slightly to the left of center in the chest area, and two lung shapes on either side of the heart.)
30. Energy Source: Sun; Makes its own food: Producer; Eats other things: Consumer.
31. It is responding to its environment (or responding to stimuli).
32. (Any three) Sunlight, water, air, soil/nutrients.
33. The rabbits would have no food, so they would starve or move away. The foxes would then lose their food source (rabbits) and would also have to move away or starve.
34. Living: seed; Non-living: pencil; Never Lived: toy car. Explanation: A seed is living because it can grow into a plant under the right conditions.
35. Herbivore: Zebra; Producer: Grass.
36. Humans have lungs which take oxygen from the air. Fish have gills which take oxygen from the water. Lungs cannot work in water.
37. (Any four) Food, water, air (a cage with ventilation), and shelter (bedding/a clean cage).
38. (Any two) Too much water, not enough water, not enough sunlight.
39. A computer is not a living thing because it does not grow, reproduce, or breathe. It needs to have ALL the characteristics of a living thing.
40. (Answers will vary). Example: Cabbage → Snail → Bird.