The main factor which limits the rate of phot | vedclass

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(C) According to Blackman's Law of Limiting Factors,when several factors affect any biochemical process,the rate of the process is limited by the fact

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$CO_2$

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(C) According to Blackman's Law of Limiting Factors,when several factors affect any biochemical process,the rate of the process is limited by the factor which is present in the lowest concentration relative to its optimum requirement.On a clear,sunny day,light is abundant and water is usually sufficient. However,the atmospheric concentration of $CO_2$ is very low (approximately $0.03-0.04\%$) compared to the amount required for optimal photosynthesis.Therefore,$CO_2$ acts as the primary limiting factor for photosynthesis under these conditions.

The main factor which limits the rate of photosynthesis on a clear day is

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