The level of CO_2 available in the atmosphere | vedclass

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(B) The concentration of $CO_2$ is a major factor affecting the rate of photosynthesis. $C_3$ plants show an increase in the rate of photosynthesis at

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$C_3$

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(B) The concentration of $CO_2$ is a major factor affecting the rate of photosynthesis. $C_3$ plants show an increase in the rate of photosynthesis at higher $CO_2$ concentrations because their enzyme $RuBisCO$ has a lower affinity for $CO_2$ and also acts as an oxygenase. In contrast,$C_4$ plants show saturation at about $360 \mu L L^{-1}$,meaning they are already efficient at low $CO_2$ concentrations. Therefore,the current atmospheric level of $CO_2$ is limiting for $C_3$ plants.

The level of $CO_2$ available in the atmosphere is limiting for $........$ plants.

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