Unit 3 Test Review

All energy on Earth comes from what source?

• Water

• Sun

• Consumers

• Oxygen

What are plants called in a food chain?

• Producers

• Decomposers

• Consumers

• Scavengers

Answer explanation

Plants are called producers because they "produce" their own food

What are animals called in a food chain?

• Producers

• Decomposers

• Consumers

• Autotrophs

Answer explanation

Animals are consumers because they need to consume plants or other animals for energy.

What are the organisms that break down dead material?

• Producers

• Decomposers

• Consumers

• Heterotrophs

Answer explanation

Decomposers are often left out of food chains and energy pyramids.

Choose all that apply: the Hawk gets energy from:

• Snake

• Owl

• Rabbit

• Mouse

Answer explanation

If a food web looks complicated, follow the arrows in reverse to find the sources of energy

Select all of the autotrophs in the food web

• Bush

• Grass

• Grasshopper

• Seeds

• Thrush

Answer explanation

Leaves and grass aren't the only edible parts of producers. Seeds and fruit are energy sources produced by prodercers too!

Select all the herbivores in the food web.

• Fox

• Grasshopper

• Owl

• Rabbit

• Mouse

Answer explanation

A good way to remember what herbivores eat: we use herbs in our cooking, which are leaves and grasses!

Bears can eat salmon from the river as well as berries from bushes. What kind of consumer are they?

• Detritivore

• Omnivore

• Herbivore

• Carnivore

Answer explanation

Omni means "all"

How much energy is transferred up the pyramid at each trophic level?

• 90%

• 20%

• 10%

• 50%

How does the energy flow in an energy pyramids?

• up the pyramid

• down the pyramid