Photosynthesis in C_4 plants is relatively le | vedclass

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(C) In $C_4$ plants,photosynthesis is less limited by atmospheric $CO_2$ levels because they possess an efficient $CO_2$ concentrating mechanism.In th

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There is an effective $CO_2$ concentrating mechanism in bundle sheath cells.

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(C) In $C_4$ plants,photosynthesis is less limited by atmospheric $CO_2$ levels because they possess an efficient $CO_2$ concentrating mechanism.In these plants,the primary fixation of $CO_2$ occurs in the mesophyll cells via the enzyme $PEP$ carboxylase,which has a very high affinity for $CO_2$ and does not bind with $O_2$.This fixed $CO_2$ is then transported to the bundle sheath cells in the form of a $4$-carbon organic acid.In the bundle sheath cells,this acid is decarboxylated to release $CO_2$,which significantly increases the local concentration of $CO_2$ around the $RuBisCO$ enzyme.This high concentration ensures that $RuBisCO$ functions efficiently in the Calvin cycle and minimizes the rate of photorespiration.

Photosynthesis in $C_4$ plants is relatively less limited by atmospheric $CO_2$ levels because:

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