Which of the following describes the amount of organic material that is available for transfer to the next trophic level after subtracting material used for respiration?

Question

Which of the following describes the amount of organic material that is available for transfer to the next trophic level after subtracting material used for respiration?
A. Biomass 
B. Gross primary productivity
C. Primary productivity
D. Net primary productivity

GPT-4o mini · Answer

The correct answer is D. Net primary productivity.

Net primary productivity (NPP) represents the amount of organic material (or biomass) that is available for transfer to the next trophic level after accounting for the energy used in respiration by primary producers. It is calculated as gross primary productivity (GPP) minus the energy used in respiration (R).