Net primary productivity is the primary productivity of an ecosystem, after subtracting energy lost inGroup of answer choicesdead plant tissues.inefficiencies of photosynthesis.inedible plant tissues.respiration by primary producers.respiration by primary consumers.

Net primary productivity is the rate at which energy is stored by organisms in a given ecosystem, after accounting for the energy lost during respiration. Here's a step-by-step breakdown:

1. Primary productivity is the rate at which energy is converted by photosynthetic and chemosynthetic autotrophs (organisms that produce complex organic compounds from simple substances present in their surroundings) to organic substances.

2. The energy stored in the form of organic substances by autotrophs is then used by them for their own metabolism (respiration, growth, reproduction, etc.) and is also made available to other organisms in the ecosystem (herbivores and decomposers).

3. However, not all of the energy that is captured by autotrophs is available for use by other organisms. A significant portion of this energy is used by the autotrophs themselves in the process of respiration.

4. Net primary productivity (NPP) is the amount of energy that remains after the energy used by autotrophs for respiration is subtracted from the total amount of energy that was originally captured by them.

So, to answer your question, net primary productivity is the primary productivity of an ecosystem after subtracting the energy lost in respiration by primary producers.