A- In C_4 plants,carboxylation takes place in | vedclass

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(B) Assertion $(A)$: In $C_4$ plants,the primary carboxylation occurs in the mesophyll cells (catalyzed by $PEP$ carboxylase),and the secondary carbox

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$A$ is true but $R$ is false.

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(B) Assertion $(A)$: In $C_4$ plants,the primary carboxylation occurs in the mesophyll cells (catalyzed by $PEP$ carboxylase),and the secondary carboxylation occurs in the bundle sheath cells (catalyzed by $RuBisCO$). Thus,the statement is true.Reason $(R)$: In $C_3$ plants,the entire process of $CO_2$ fixation (carboxylation) occurs exclusively in the mesophyll cells. Bundle sheath cells in $C_3$ plants do not contain chloroplasts capable of the Calvin cycle. Thus,the statement is false.Therefore,$A$ is true but $R$ is false.

$A-$ In $C_4$ plants,carboxylation takes place in the chloroplasts of mesophyll cells and bundle sheath cells.
$R -$ In $C_3$ plants,$CO_2$ fixation occurs in mesophyll cells and bundle sheath cells.

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$A-$ In $C_4$ plants,carboxylation takes place in the chloroplasts of mesophyll cells and bundle sheath cells.$R -$ In $C_3$ plants,$CO_2$ fixation occurs in mesophyll cells and bundle sheath cells.