Understanding Food Webs and Chains

What role do turtles play in their ecosystems?

• They are decomposers.

• They are keystone species.

• They are energy producers.

• They are primary consumers.

Which of the following is NOT a trophic level in a simple food chain?

• Energy producer

• Primary consumer

• Tertiary consumer

• Producer

In a pond ecosystem, what is the role of crayfish?

• Energy producer

• Primary consumer

• Producer

• Secondary consumer

How does a food web differ from a food chain?

• A food web is simpler than a food chain.

• A food web shows multiple interactions among organisms.

• A food web only includes plants.

• A food web is a linear sequence of organisms.

What might happen if a species in a food web disappears?

• All species in the web become extinct.

• There is an increase or decrease in other species.

• The ecosystem remains unchanged.

• New species immediately replace the missing one.