Chapter 4 Test

Why do chipmunks in the Great Smoky Mountains survive?

• Their needs are met in that environment
• They have driven out all the other chipmunks
• Human feed them, which helps them survive
• Humans have moved them from cities to the mountains

Which describes a balanced ecosystem?

• There is enough foor for people to exist
• One type of animal and plant depend on each other
• No animal or plant drives out other animals and plants
• Humans create shelter and food for animals and plants

A meadow has too many rabbits. What would help balance this ecosystem?

• More rain that grass needs
• More foxes that eat rabbits
• Fewer foxes that eat rabbits
• More grass for rabbits to eat

How do these organisms interactions help balance their ecosystem?

• Rabbits make homes in grass
• Grass and rabbits both need oxygen
• Grass makes oxygen and animals use it
• Grass depends on rabbits to protect it

How would an ecosystem change if the rabbits that were the main prey for foxes became sick and died?

• The foxes would find new prey
• The number of foxes would increase
• The number of foxes would decrease
• The foxes and rabbits would compete for food

What impact does a parasite have in an ecosystem?

• helps the entire ecosystem
• hurts one organism and helps another
• help both the host organism and parasite
• hurts both the host organism and parasite

What does this illustration show?

• Succession
• Parasites and hosts
• Pioneer communitites
• Competition between consumers

Which would cause an ecosystem to change quickly?

• An earthquake
• A lake drying up
• A climate change
• A lake becoming a marsh

What might be the effect on an ecosystem of a climate change from rainy to dry?

• no change
• a change from plants to animals
• change from a forest to marsh
• a change in kinds of plants and animals

What could scientists tell from a fish fossil found in a desert?

• That fish is now extinct
• Fish once had legs to travel
• Fish once lived in dry places
• The desert was once a sea or lake