Grade 3 Science Worksheet (Food Chain) for 9-Year-Olds — 40 Objective, 20 Short Answer, 10 Problem Solving — Cambridge-Aligned

Part A: Objective Questions

Circle the correct answer for questions 1-20.

1. What is an organism that makes its own food called?
   a) Consumer b) Producer c) Decomposer
2. Which of the following is a producer?
   a) Lion b) Mushroom c) Grass
3. What do the arrows in a food chain show?
   a) Where an animal lives b) The flow of energy c) How big an animal is
4. An animal that eats only plants is called a...
   a) Carnivore b) Herbivore c) Omnivore
5. Which of these is a carnivore?
   a) Cow b) Rabbit c) Wolf
6. What is the main source of energy for almost all food chains on Earth?
   a) The Moon b) The Sun c) The Wind
7. An animal that is hunted and eaten by another animal is called...
   a) A predator b) A producer c) Prey
8. In the food chain: Grass -> Zebra -> Lion, the zebra is the...
   a) Producer b) Primary Consumer c) Secondary Consumer
9. What is the role of a mushroom in a food chain?
   a) Producer b) Consumer c) Decomposer
10. An animal that eats both plants and other animals is a(n)...
    a) Omnivore b) Herbivore c) Carnivore
11. Which of these is an example of an omnivore?
    a) Deer b) Bear c) Shark
12. A food chain always starts with a...
    a) Carnivore b) Herbivore c) Producer
13. Which animal is at the top of this food chain: Seeds -> Mouse -> Snake -> Hawk?
    a) Mouse b) Snake c) Hawk
14. A consumer that eats a primary consumer is called a...
    a) Producer b) Secondary Consumer c) Decomposer
15. What do decomposers break down?
    a) Sunlight b) Living plants c) Dead plants and animals
16. An animal that hunts other animals for food is called a...
    a) Predator b) Prey c) Producer
17. Which of these is NOT a consumer?
    a) A tree b) A rabbit c) A fox
18. A food web is...
    a) A single food chain b) Many connected food chains c) A spider's home
19. A plant is a producer because it makes its own...
    a) Water b) Food c) Babies
20. If there were no plants, what would herbivores eat?
    a) Carnivores b) Nothing c) The soil

For questions 21-30, write 'True' or 'False' on the line.

• 21. A lion is a herbivore. _______________
• 22. Plants get their energy from the sun. _______________
• 23. A food chain shows how energy is passed from one living thing to another. _______________
• 24. All food chains end with a producer. _______________
• 25. Decomposers are an important part of the ecosystem. _______________
• 26. An omnivore eats only meat. _______________
• 27. A rabbit is a primary consumer. _______________
• 28. Arrows in a food chain point to the animal that is being eaten. _______________
• 29. A snake that eats a mouse is a secondary consumer. _______________
• 30. Humans are consumers. _______________

For questions 31-40, match the organism to its role in the food chain. Write the correct letter on the line.

Organisms:

• 31. Grass _______________
• 32. Lion _______________
• 33. Mushroom _______________
• 34. Cow _______________
• 35. Bear _______________
• 36. Oak Tree _______________
• 37. Shark _______________
• 38. Worm _______________
• 39. Chicken _______________
• 40. Deer _______________

Roles:
A. Producer
B. Herbivore (Primary Consumer)
C. Carnivore (Secondary/Tertiary Consumer)
D. Omnivore
E. Decomposer

Part B: Short Answer Questions

Write a short answer for each question.

1. What do we call an animal that only eats meat? _________________________
2. What is the first link in any food chain? _________________________
3. Name one example of a decomposer. _________________________
4. In the food chain Leaf -> Snail -> Bird, what is the producer? _________________________
5. An organism that cannot make its own food is called a what? _________________________
6. What is the name for the process plants use to make food with sunlight? _________________________
7. Give an example of a herbivore. _________________________
8. If a fox eats a rabbit, which animal is the predator? _________________________
9. What do all living things need to survive? _________________________
10. A collection of many overlapping food chains in an ecosystem is a _______________.
11. What type of consumer eats producers? _________________________
12. Give an example of a carnivore. _________________________
13. In the food chain Plankton -> Shrimp -> Fish, what does the fish eat? _________________________
14. What would happen to the number of lions if all the zebras disappeared? _________________________
15. What do we call an animal that eats both plants and meat? _________________________
16. Name one thing a decomposer helps put back into the soil. _________________________
17. If a mouse eats seeds, what kind of consumer is the mouse? _________________________
18. An animal that is hunted is called the _______________.
19. What is at the top of the food chain: Grass -> Grasshopper -> Frog -> Snake? _________________________
20. Why is the sun important for all food chains? _________________________

Part C: Problem Solving

Use your knowledge of food chains to solve the problems.

1. Create a food chain using the following three living things: Mouse, Corn, Owl. Draw arrows to show the flow of energy.
   ____________________________________________________
2. Look at this food chain: Carrot -> Rabbit -> Fox.
   a) What is the producer? ____________________
   b) What is the secondary consumer? ____________________
3. What is wrong with this food chain? Eagle -> Snake -> Mouse
   ____________________________________________________
4. Imagine a forest where all the snakes suddenly vanished. What might happen to the number of mice?
   ____________________________________________________
5. Draw a simple food chain you might find in the ocean. It must have at least three links.
   ____________________________________________________
6. An animal eats berries, fish, and insects. What kind of consumer is it? (Herbivore, Carnivore, or Omnivore)
   ____________________________________________________
7. Fill in the blank with a type of organism: ____________ -> Caterpillar -> Bird
   ____________________________________________________
8. If a person eats a chicken, and the chicken ate corn, what is the person in this food chain?
   a) A primary consumer b) A secondary consumer c) A producer
9. Why are there usually fewer animals at the top of a food chain than at the bottom?
   ____________________________________________________
10. Explain why decomposers are like the 'clean-up crew' of an ecosystem.
    ____________________________________________________