Compare $C_{4}$ and $C_{3}$ pathways of $C O_{2}$ fixation during photosynthesis. Give well labelled schematic sketch of $C_{4}$ pathway.

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Solution

$C_{4}$ pathway is also known as Hatch and Slack pathway.
Comparison between $C_{3}$ and $C_{4}$ pathways
$C_{3}$ pathway $C_{4}$ pathway
The primary acceptor of $C O_{2}$ is RuBP - a six carbon compound. The primary acceptor of $C O_{2}$ is PEP - a three carbon compound.
The first stable product is 3-phosphoglycerate. The first stable product is oxaloacetic acid.
It occurs in the mesophyll cells of the leaves. It occurs in the mesophyll and bundle-sheath cells of the leaves.
It is a slower process of carbon-fixation. It is a faster process of carbon fixation.
3 ATP are consumed to fix one $C O_{2}$ . 2 ATP are consumed to fix one $C O_{2}$ .

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$C_{3}$ pathway	$C_{4}$ pathway
The primary acceptor of $C O_{2}$ is RuBP - a six carbon compound.	The primary acceptor of $C O_{2}$ is PEP - a three carbon compound.
The first stable product is 3-phosphoglycerate.	The first stable product is oxaloacetic acid.
It occurs in the mesophyll cells of the leaves.	It occurs in the mesophyll and bundle-sheath cells of the leaves.
It is a slower process of carbon-fixation.	It is a faster process of carbon fixation.
3 ATP are consumed to fix one $C O_{2}$ .	2 ATP are consumed to fix one $C O_{2}$ .