Trophic Levels

What does an energy pyramid show?

• The number of organisms in an ecosystem

• The flow of energy between trophic levels

• The size of different animals

• The amount of water in an ecosystem

Which organisms are at the base of an energy pyramid?

• Primary consumers

• Producers

• Secondary consumers

• Decomposers

In a food chain, what do primary consumers eat?

• Other consumers

• Producers

• Decomposers

• Nothing—they make their own food

Only about ___% of energy is transferred from one trophic level to the next.

• 100

• 50

• 10

• 1

True or False: Energy flows from the top of the energy pyramid down to the base.

• True

• False

Which of the following is a secondary consumer?

• Grass

• Rabbit

• Snake

• Hawk

Which level of the energy pyramid has the most energy available?

• Producers

• Primary consumers

• Secondary consumers

• Tertiary consumers

What happens to the energy that is not transferred to the next level?

• It disappears

• It is used for heat and life processes

• It is stored forever

• It moves to the top of the pyramid

The process that producers use to make their own food is called ______.

• Photosynthesis

• Respiration

• Digestion

• Transpiration

Which of these is a top predator (tertiary consumer) in a food chain?

• Grasshopper

• Frog

• Eagle

• Squirrel