Energy in Ecosystems

All food webs and food chains begin with _________________.

• primary consumer

• producers

• secondary consumers

• tertiary consumers

What percentage of energy is passed on to each tropic level?

• 10%

• 50%

• 90%

• 100%

Organisms which carry out the process of decomposition by breaking down dead or decaying organisms.

• Consumer

• Producer

• Decomposer

• Herbivore

For a pyramid of numbers, the width of the bar shows the__________ of organisms present in each trophic level at a particular time. 

• number

• biomass

• energy

• volume

Which of the following shows the correct pyramid of numbers for the food chain?

• A

• B

Which of the following shows the correct pyramid of numbers for the food chain?

• A

• B

Net Primary Production refers to:

• the rate at which all plants in an ecosystem produce net useful chemical energy.

• the rate at which primary producers save and collect biomass for energy conservation.

Net Primary Production is calulated by:

• GPP - respiration

• 
  GPP - waste

• GPP - biomass

• GPP - photosynthesis

Gross Primary Production refers to:

• the rate at which all plants in an ecosystem produce net useful chemical energy.

• the rate at which primary producers save and collect biomass for energy conservation.

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

• 
  80%

• 
  90%

• 10%

• 
  20%