Ecosystems Part 1: Test Review

A marsh food chain is shown.

Grass → Grasshopper → Toad → Snake → Hawk

According to the food chain, how would an increase in the toad population most likely affect the other populations?

• The grass population would decrease.

• The hawk population would decrease.

• The snake population would decrease.

• The grasshopper population would decrease.

Which organisms eat only plants?

• producers

• omnivores

• herbivores

• scavengers

American alligators are common in Florida wetlands. They are known to eat frogs, turtles, fish, mice, and birds. What role does an American alligator fill in its ecosystem?

• consumer

• decomposer

• scavenger

• producer

A diagram of a partial food web is shown below. Which is a food chain that makes up part of this food web?

• Shrub → Mouse → Snake → Hawk

• Grass → Grasshopper → Lizard → Fox

• Shrub → Robin → Lizard → Hawk

• Grass → Rabbit → Snake → Hawk

A chicken is able to gain energy that came from the Sun by

• eating seeds.

• drinking water

• laying eggs

• breathing oxygen

People take in and release gases from the air when they breathe. Which exhaled gas is a waste product of respiration?

• oxygen

• helium

• hydrogen

• carbon dioxide

The food chain shows the flow of energy through an ecosystem. What is the role of decomposers in the system?

• They recycle oxygen back into the ecosystem.

• They recycle energy from dead organisms back to the ecosystem.

• They absorb energy from sunlight to pass on to other organisms.

• They obtain and use the energy that remains in living organisms.

Which organisms are responsible for recycling nutrients from other decaying organisms?

• consumer

• decomposer

• predator

• producer

The diagram shows some organisms in an Antarctic food chain.

Sun → Algae → Krill → Cod → Seal → Whale

Which BEST describes the role of krill in this food chain?

• producers

• decomposers

• primary consumers

• secondary consumers

How do producers get energy?

• by eating animals

• by eating plants and seeds

• by using sunlight to make food

• by breaking down other organisms