Energy and Ecosystems Practice Questions

What is the major source of almost all the energy in most ecosystems?

• carbohydrates

• water

• Sunlight

• carbon

Which trophic level contains the greatest amount of energy?

• producer

• carnivore

• herbivore

• top predator

In the energy pyramid shown above, how much of the energy in each level gets lost as heat or used by the organism for survival?

• 80%

• 90%

• 10%

• 20%

If there is 1000 Kcal available in the producers in trophic level 1, how much energy is available in the herbivores in trophic level 2?

• 1000 Kcal

• 100 Kcal

• 10 Kcal

• 1 Kcal

If these organisms were arranged in a food pyramid, which organism would have the least amount of total energy available?

• A. coyotes

• B. insects

• C. lizards

• D. shrubs

Place the organisms in each food chain into the proper location on the energy pyramid starting with the bottom of the pyramid.

• Plant → insect → frog → hawk

• Hawk → frog → insect → plant

• Frog → insect → plant → hawk

• Insect → plant → hawk → frog

If 1,000 kcal of energy is available for the 1st trophic level, 100 kcal for the 2nd trophic level, 10 kcal for the 3rd trophic level. How many kcal are available for the tertiary consumer?

• 1 kcal

• 0.1 kcal

• 5 kcal

• 0.01 kcal

There is 2,500 kcal available for the 1st trophic level. There is ____ kcal available for the 2nd trophic level. There is ____ kcal available for the 3rd trophic level. There is 2.5 kcal available for the 4th trophic level.

• 250, 25

• 500, 50

• 100, 10

• 200, 20

10% of 2500 Kcal = ______ Kcal and 10% of 250 Kcal = ______ Kcal

• 250 Kcal and 25 Kcal

• 200 Kcal and 20 Kcal

• 300 Kcal and 30 Kcal

• 150 Kcal and 15 Kcal

The purpose of this pyramid is to demonstrate what?

• the amount of biomass at each trophic level

• the amount of energy at each trophic level

• the number of organisms at each trophic level

• the niche of each organism at each trophic level