. The standing crop retains some of the nutrients when the uptake exceeds internal cycling. This retention is equated as


A. Retention = Uptake + Recycle

B. Retention = Uptake – Recycle

C. Retention = Uptake/Recycle

D. Retention = Recycle – Uptake

Best Answer

B.

The formation and utilization of nutrients occur side by side in the ecosystem. Nutrients are used up by the absorption of plants. They are continuously regenerated and stored in the soil by decomposition. Thus, there is a balance. But when the uptake exceeds internal cycling, the standing crop retains some of the nutrients. Therefore, retention is equated as,

Retention = Uptake - Recycle  

 

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