In C_4 plants,the initial carbon dioxide fixa | vedclass

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(B) In $C_4$ plants,the process of carbon dioxide fixation occurs in two stages in different cell types.$1$. The primary $CO_2$ fixation occurs in the

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Spongy mesophyll cells

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(B) In $C_4$ plants,the process of carbon dioxide fixation occurs in two stages in different cell types.$1$. The primary $CO_2$ fixation occurs in the mesophyll cells,where $CO_2$ is accepted by Phosphoenolpyruvate $(PEP)$ to form a $4$-carbon compound,Oxaloacetic acid $(OAA)$.$2$. This $4$-carbon compound is then transported to the bundle sheath cells,where it undergoes decarboxylation to release $CO_2$ for the Calvin cycle.$3$. Therefore,the initial fixation of $CO_2$ happens in the mesophyll cells (which include both palisade and spongy types depending on the leaf structure,but specifically the mesophyll tissue).$4$. Given the options,since the primary fixation is a characteristic of mesophyll cells,and the question asks for the site of fixation,the most accurate answer in the context of $C_4$ pathway initiation is the mesophyll cells.

In $C_4$ plants,the initial carbon dioxide fixation occurs in:

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