Question

1 mark for review which of the following best describes gross primary productivity in an ecosystem? a gross primary productivity is the total amount of energy captured by producers plus the energy used by consumers over time. b gross primary productivity is the total amount of energy captured by producers minus the energy that producers respire over time. c gross primary productivity is the total amount of energy lost as heat during energy transfer between trophic levels. d gross primary productivity is the total amount of solar energy captured by producers through photosynthesis over time.

Explanation:

Gross primary productivity (GPP) is the total amount of solar energy that producers in an ecosystem capture through photosynthesis over a given period of time. It does not account for energy used by consumers, energy lost as heat in energy - transfer, or energy used in respiration by producers. Net primary productivity (NPP) is GPP minus the energy that producers respire.

Answer:

D. Gross primary productivity is the total amount of solar energy captured by producers through photosynthesis over time.