The C_{4}-plants are photosynthetically more | vedclass

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(B) $C_{4}$-plants are more efficient because they possess a mechanism to minimize photorespiration. In $C_{4}$-plants,the enzyme $PEP$ carboxylase fi

Vedclass · Accepted Answer

Carbon dioxide generated during photorespiration is trapped and recycled through $PEP$ carboxylase

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(B) $C_{4}$-plants are more efficient because they possess a mechanism to minimize photorespiration. In $C_{4}$-plants,the enzyme $PEP$ carboxylase fixes $CO_{2}$ in mesophyll cells,which has a high affinity for $CO_{2}$ and does not bind with $O_{2}$. This process pumps $CO_{2}$ into the bundle sheath cells,creating a high concentration of $CO_{2}$ around the enzyme $RuBisCO$. This high concentration effectively suppresses the oxygenase activity of $RuBisCO$,thereby preventing photorespiration and ensuring higher photosynthetic efficiency compared to $C_{3}$-plants.

The $C_{4}$-plants are photosynthetically more efficient than $C_{3}$-plants because

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