The amount of biomass produced by the plants through photosynthesis minus…
2024
The amount of biomass produced by the plants through photosynthesis minus respiration losses in a given time period is known as:
- A.
Gross Primary Productivity
- B.
Net Primary Productivity
- C.
Gross Ecological Productivity
- D.
Net Secondary Productivity
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Correct answer: B
Answer: Net Primary Productivity
Definition: Net Primary Productivity (NPP) is the rate at which plants accumulate biomass in a given time period after subtracting the energy they use in respiration.
Key formula: NPP = GPP − R (where GPP is Gross Primary Productivity and R is plant respiration).
Units: commonly expressed as mass of carbon or biomass per unit area per time (for example, g C m−2 yr−1).
Why the other choices are incorrect:
Gross Primary Productivity: This is the total carbon fixed by photosynthesis before subtracting plant respiration, so it does not represent the net biomass remaining.
Gross Ecological Productivity: This is not a standard term for plant production after respiration and is ambiguous; it is not the accepted term for the quantity asked.
Net Secondary Productivity: Refers to biomass produced by consumers (animals) after their respiration, not to plant biomass, so it is not the correct answer.
Summary: The correct term for plant biomass produced through photosynthesis minus plant respiration losses is Net Primary Productivity (NPP).
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