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The mass of living material.at a trophic...

The mass of living material.at a trophic level at a particular time is called

A

Net primary productivity

B

Standing Crop

C

Gross primary productivity

D

Standing state

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The correct Answer is:
To solve the question regarding the mass of living material at a trophic level at a particular time, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the Terms**: - We need to identify what "mass of living material" refers to in ecological terms. This is typically associated with biomass at a specific trophic level. 2. **Identifying the Options**: - The options provided are: 1. Net Primary Productivity (NPP) 2. Standing Crop 3. Gross Primary Productivity (GPP) 4. Standing State 3. **Analyzing Each Option**: - **Net Primary Productivity (NPP)**: This refers to the amount of organic matter (biomass) produced by plants after accounting for respiration. It is not a measure of the mass at a specific time but rather a rate of production over time. - **Standing Crop**: This term refers to the total mass of living material (biomass) present at a given trophic level at a specific time. This is what the question is asking for. - **Gross Primary Productivity (GPP)**: This is the total amount of organic material produced by photosynthesis before any is used for respiration. Like NPP, it is a rate, not a mass at a specific time. - **Standing State**: This term typically refers to the inorganic mass in an ecosystem, not the organic mass of living organisms. 4. **Conclusion**: - After analyzing the options, the correct answer is **Standing Crop**, as it directly refers to the mass of living material at a trophic level at a particular time. ### Final Answer: The mass of living material at a trophic level at a particular time is called **Standing Crop**. ---
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