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In an ecosystem, at a particular time, s...

In an ecosystem, at a particular time, standing crop

A

total living material

B

total detritus

C

both (a) and (b)

D

total nutrients present in the crop.

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### Step-by-Step Solution: 1. **Understanding Standing Crop**: - The term "standing crop" refers to the total biomass of living organisms present in an ecosystem at a specific point in time. This includes all plants and animals that are alive and can be measured in terms of weight or energy. 2. **Definition of Biomass**: - Biomass is the total mass of living matter in a given area or volume. It is a crucial component of an ecosystem as it represents the energy available for consumption by other organisms. 3. **Evaluating Options**: - The first option states "Total Living Material". This aligns with the definition of standing crop since it refers to the biomass of living organisms at a given time. - The second option mentions "Total Dead Treaters". This refers to decomposers and dead organic matter, which do not contribute to the standing crop as they are not living organisms. - The third option discusses "Total Nutrients". While nutrients are important for ecosystem functioning, they do not define the standing crop. 4. **Conclusion**: - Based on the definitions and evaluations, the correct answer is the first option: "Total Living Material". This accurately describes what a standing crop is in an ecosystem.
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