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(C) The provided diagram represents the $C_4$ photosynthetic pathway (Hatch-Slack pathway).$1$. In the mesophyll cells,$CO_2$ is fixed by $PEP$ carbox

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Fixation $-$ decarboxylation $-$ regeneration

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(C) The provided diagram represents the $C_4$ photosynthetic pathway (Hatch-Slack pathway).$1$. In the mesophyll cells,$CO_2$ is fixed by $PEP$ carboxylase to form oxaloacetate,which is then converted into malate or aspartate. This step is represented by '$a$' (Fixation).$2$. These $C_4$ acids are transported to the bundle sheath cells,where they undergo decarboxylation to release $CO_2$ for the Calvin cycle. This step is represented by '$b$' (Decarboxylation).$3$. The remaining $C_3$ acid is transported back to the mesophyll cells,where it is converted back into $PEP$ to continue the cycle. This step is represented by '$c$' (Regeneration).Therefore,the correct sequence is Fixation $(a)$,Decarboxylation $(b)$,and Regeneration $(c)$.

Choose the correct option for $a, b, c$ in the given diagram of the $C_4$ pathway.
$a - b - c$

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Choose the correct option for $a, b, c$ in the given diagram of the $C_4$ pathway.$a - b - c$