In nature,the rate of photosynthesis is prima | vedclass

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(C) According to Blackman's Law of Limiting Factors,if a chemical process is affected by more than one factor,then its rate will be determined by the

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$CO_2$

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(C) According to Blackman's Law of Limiting Factors,if a chemical process is affected by more than one factor,then its rate will be determined by the factor which is nearest to its minimal value: it is the factor which directly affects the process if its quantity is changed.In nature,$CO_2$ concentration is usually the major limiting factor for photosynthesis because its atmospheric concentration is very low $(0.03-0.04\%)$ compared to the requirement for optimal photosynthetic activity. While light and temperature also affect the rate,$CO_2$ is frequently the limiting factor under natural conditions.

In nature,the rate of photosynthesis is primarily limited by which of the following factors?

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$A-$ The $C_3$ and $C_4$ plants respond differently to $CO_2$ concentrations.
$R -$ The concentration of $CO_2$ in the atmosphere is between $0.03$ and $0.04$ percent. An increase in concentration up to $0.05$ percent can cause an increase in $CO_2$ fixation rates.

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