1. Food Chains and Food Webs
3rd Grade

2. Question 1
In this food chain, the arrows are used to show the flow of energy. The grasshopper gets its energy directly from the ----
Sun  Grass  Grasshopper  Frog
A. Grass
B. Snake
C. Frog
D. Sun

3. Answer
A. Grass

4. Question 2
Which statement correctly describes how energy flows in the food chain shown here?
Sun  Plant  Mosquito  Bird
A. From plant to Sun
B. From snake to mosquito
C. From bird to plant
D. From mosquito to bird

5. Answer
D. From mosquito to bird

6. Question 3 The squirrel gets its energy directly from ----
Sun  Tree  Squirrel  Hawk
A. the Sun
B. the tree
C. the other squirrels
D. the hawk

7. Answer
B. the tree

8. Question 4
The diagram shows an incomplete food chain. Which of the following would complete the food chain?
Sun  ________  Insects  Frogs  Snakes
A. Small fish
B. Mosquitos
C. Green plants
D. Bald eagles

9. Answer
C. Green plants

10. Question 5
If the mice are removed from this food chain, which animal population would most likely be affected first?
Sun  Plant seeds  Field mouse  Snake  Mountain Lion
A. Plant seeds
B. Field mice
C. Snakes
D. Mountain lions

11. Answer
C. Snakes

12. Question 6
Which of the following is represented in the food chain below?
Sun  Plants  Insects  Fish  Humans
A. Evaporation of water
B. Transfer of energy
C. Reflection of light
D. Changing of phase

13. Answer
B. Transfer of energy

14. Question 7
What is most likely this first thing to result from having fewer field mice in the food chain pictured here?
Sun  Plant seeds  Field mouse  Snake  Eagle
A. The snakes would have to find another food source.
B. The plants that make seeds would decrease in number.
C. The eagles would have to fly away to a different location.
D. The new fish population will decrease.

15. Answer
A. The snakes would have to find another food source.

16. Question 8
A new fish is introduced in a pond that also eats the plants. What changes would occur in this pond ecosystem?
A. The large fish population will decrease
B. The plant population will decrease.
C. The small fish population will increase.
D. The new fish population will decrease.

17. Answer
B. The plant population will decrease.

18. Question 9
Which of the following correctly shows how energy moves through a food chain?
A. Sun  meat eaters  plants  plant eaters
B. Sun  plants  plant eaters  meat eaters
C. Sun  plant eaters  meat eaters  plants
D. Sun  plants  meat eaters  plant eaters

19. Answer
B. Sun  plants  plant eaters  meat eaters

20. Question 10
Based on the food chain illustrated below, what effect would most likely be a direct result of increasing the number of fish?
Sun  Plant  Beetle Fish
A. Beetles would have trouble finding food.
B. There would be more kinds of plants.
C. The population of beetles would decrease.
D. Plants would no longer survive in this habitat.

21. Answer
C. The population of beetles would decrease.

22. Question 11 Which of the following uses the Sun’s energy to grow?
A. Plants
B. Humans
C. Birds
D. Water

23. Answer
A. Plants

24. Question 12 List two organisms that use the Sun’s energy to survive:
1. _____________________________
2. _____________________________

25. Answer
Any type of plant uses the Sun’s energy

26. Question 13
List two organisms eat other animals to survive: 1. _____________________________ 2. _____________________________

27. Answer
Any type of meat eater gets its energy from other animals

28. Question 14
Use the following words to correctly fill in the food chain: grains, mouse, fox, and Sun. _______________  ______________  _______________  _______________

29. Answer
Sun  grains  mouse  fox

30. Question 15
What is the original source of energy for all organisms in a pond ecosystem?
A. Water
B. Plants
C. Animals
D. Sun

31. Answer
D. Sun

32. Question 16
Which food chain shows the correct flow of energy through a prairie ecosystem?
A. Bird  Mouse  Plant  Sun
B. Sun  Plant  Mouse  Bird
C. Mouse  Plant  Sun  Bird
D. Plant  Sun  Bird  Mouse

33. Answer

34. Question 17
A disease is causing plants not to grow in this habitat. How will this affect the food chain? The number of ----
Sun  Plant  Small fish  Large fish
A. large fish will increase
B. small fish will increase
C. small fish will decrease
D. sunlight will increase

35. Answer
C. small fish will decrease

36. Question 18
A __________________ shows how energy moves through the environment.
A. decomposer
B. list
C. graphic chart
D. food chain

37. Answer
D. food chain

38. Question 19
A model that shows how food chains overlap is called a _________________.
A. food chain
B. organism list
C. food web
D. predator

39. Answer
C. food web

40. Question 20
An animal that hunts another animal for food is called a _______________________.
A. prey
B. consumer
C. decomposer
D. predator

41. Answer
D. predator