Greater primary productivity depends upon

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(C) Primary productivity is the rate at which biomass or organic matter is produced per unit area over a time period by plants during photosynthesis.I

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Both $(a)$ and $(b)$

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(C) Primary productivity is the rate at which biomass or organic matter is produced per unit area over a time period by plants during photosynthesis.It is primarily controlled by environmental factors such as solar radiation,temperature,moisture (rain/humidity),and the availability of nutrients in the soil.High humidity and adequate rainfall support lush vegetation,which increases productivity.Similarly,the availability of essential nutrients in the soil is crucial for plant growth and metabolic processes,directly influencing primary productivity.Therefore,both rain (humidity) and the availability of nutrients are essential for greater primary productivity.

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