Chapter 4 Review

1. Chapter 4 Review

2. Question 1 Which describes a balanced ecosystem? • a. There is enough food for people to exist. • b. One type of animal and plant depend on each other. • c. No animal or plant drives out other animals or plants. • d. Humans create shelter and food for animals and plants.

3. Answer… • c. No animal or plant drives out other animals or plants.

4. Question 2 A meadow has too many rabbits. What would help balance this ecosystem? • a. more rain that grass needs • b. more foxes that eat rabbits • c. fewer foxes that eat rabbits • d. more grass for rabbits to eat

5. Answer… • b. more foxes that eat rabbits

6. Question 3 How do grass and rabbits’ interactions help balance their ecosystem? • a. Rabbits make homes in grass. • b. Grass and rabbits both need oxygen. • c. Grass makes oxygen, and animals use it. • d. Grass depends on rabbits to protect it.

7. Answer… • c. Grass makes oxygen, and animals use it.

8. Question 4 What impact does a parasite have in an ecosystem? • a. helps the entire ecosystem • b. hurts one organism and helps another • c. helps both the host organism and parasite • d. hurts both the host organism and parasite

9. Answer… • b. hurts one organism and helps another

10. Question 5 How would an ecosystem change if the rabbits that were the main prey for foxes became sick and died? • a. The foxes would find new prey. • b. The number of foxes would increase. • c. The number of foxes would decrease. • d. The foxes and rabbits would compete for food.

11. Answer… • c. The number of foxes would decrease.

12. Question 6 Which would cause an ecosystem to change quickly? • a. an earthquake • b. a lake drying up • c. a climate change • d. a lake becoming a marsh

13. Answer… • a. an earthquake

14. Question 7 What might be the effect on an ecosystem of a climate change from rainy to dry? • a. no change • b. a change from plants to animals • c. a change from a forest to marsh • d. a change in kinds of plants and animals

15. Answer… • d. a change in kinds of plants and animals

16. Question 8 What could scientists tell from a fish fossil found in a desert? • a. That fish is now extinct. • b. Fish once had legs to travel. • c. Fish once lived in dry places. • d. The desert was once a sea or lake.

17. Answer… • d. The desert was once a sea or lake.

18. Question 9 What might be a reason an animal becomes extinct? • a. It is a predator. • b. It produces oxygen. • c. Its habitat is destroyed. • d. It adapts to its environment.

19. Answer… • c. Its habitat is destroyed.

20. Question 10 What is one way people can disturb the balance of ecosystems? • a. breathing air • b. planting trees • c. riding bicycles • d. building houses

21. Answer… • d. building houses

22. Question 11 How are a hawk and an owl able to succeed, even though they compete for food? • a. The hawk eats the owl. • b. The owl changes its diet. • c. One animal moves to a different habitat. • d. One hunts at night, and the other hunts during daytime.

23. Answer… • d. One hunts at night, and the other hunts during daytime.

24. Question 12 Why did the United States establish national parks? • a. to make money for the national government • b. to provide Americans with great vacation spots • c. to preserve nature’s beauty and habitats of plants and animals • d. to give Americans a chance to see things they’ve never seen before.

25. Answer… • c. to preserve nature’s beauty and habitats of plants and animals

26. Question 13 How can damage from strip mines be repaired? • a. Erosion can fill the hole. • b. Mining companies can replace the soil. • c. Rain can wash the rock away into rivers. • d. Mining companies can go mine in another place.

27. Answer… • b. Mining companies can replace the soil.