Chapter 4 ReviewChapter 4 Review

Question 1Question 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.

Answer…Answer…

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

Question 2Question 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

Answer…Answer…

• b. more foxes that eat rabbits

Question 3Question 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.

Answer…Answer…

• c. Grass makes oxygen, and animals use it.

Question 4Question 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

Answer…Answer…

• b. hurts one organism and helps another

Question 5Question 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.

Answer…Answer…

• c. The number of foxes would decrease.

Question 6Question 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

Answer…Answer…

• a. an earthquake

Question 7Question 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

Answer…Answer…

• d. a change in kinds of plants and animals

Question 8Question 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.

Answer…Answer…

• d. The desert was once a sea or lake.

Question 9Question 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.

Answer…Answer…

• c. Its habitat is destroyed.

Question 10Question 10

What is one way people can disturb the balance of ecosystems?

• a. breathing air

• b. planting trees

• c. riding bicycles

• d. building houses

Answer…Answer…

• d. building houses

Question 11Question 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.

Answer…Answer…

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

Question 12Question 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.

Answer…Answer…

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

Question 13Question 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.

Answer…Answer…

• b. Mining companies can replace the soil.