C_4 plants are more efficient in photosynthes | vedclass

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(D) $C_4$ plants are highly efficient in photosynthesis because they possess a specialized mechanism to concentrate $CO_2$ around the enzyme Rubisco.I

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The primary fixation of $CO_2$ is mediated by $PEP$ carboxylase.

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(D) $C_4$ plants are highly efficient in photosynthesis because they possess a specialized mechanism to concentrate $CO_2$ around the enzyme Rubisco.In $C_4$ plants,the primary fixation of $CO_2$ occurs in the mesophyll cells,where $PEP$ carboxylase $(PEPCase)$ acts as the primary carboxylating enzyme.$PEPCase$ has a very high affinity for $CO_2$ and,unlike Rubisco,it does not show oxygenase activity.This enzyme fixes $CO_2$ into a four-carbon compound (oxaloacetate),which is then transported to the bundle sheath cells.In the bundle sheath cells,this compound is decarboxylated to release a high concentration of $CO_2$,which is then utilized by Rubisco for the Calvin cycle.This mechanism minimizes photorespiration and ensures efficient carbon fixation even at low $CO_2$ concentrations.

$C_4$ plants are more efficient in photosynthesis because they obtain more $CO_2$ due to:

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