In the maize plant,CO_2 fixation occurs in bo | vedclass

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(D) The correct answer is $D$. Maize is a $C_4$ plant. In $C_4$ plants,$CO_2$ fixation occurs in two stages in different cell types. In the mesophyll

Vedclass · Accepted Answer

$PEP$ carboxylase and RuBisCO

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(D) The correct answer is $D$. Maize is a $C_4$ plant. In $C_4$ plants,$CO_2$ fixation occurs in two stages in different cell types. In the mesophyll cells,the primary $CO_2$ acceptor is phosphoenol pyruvate $(PEP)$,a $3$-carbon molecule. The enzyme responsible for this initial fixation is $PEP$ carboxylase $(PEPcase)$. After the formation of $C_4$ acids,they are transported to the bundle sheath cells. In the bundle sheath cells,the $C_4$ acids are broken down to release $CO_2$,which is then fixed by the enzyme $RuBisCO$ via the Calvin cycle to produce sugars. Therefore,the enzymes involved in mesophyll and bundle sheath cells are $PEP$ carboxylase and $RuBisCO$,respectively.

In the maize plant,$CO_2$ fixation occurs in both mesophyll and bundle sheath cells. The enzymes involved in these cells for the process respectively are

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