Tabulate any four differences between ${ C }_{ 3 }$ and ${ C }_{ 4 }$ plants.

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Hint: ${ C }_{ 3 }$ plants are plants in which the biosynthetic pathway Calvin cycle operates inside the mesophyll cells to fix carbon in order to produce glucose. Whereas in ${ C }_{ 4 }$ plants, the ${ C }_{ 4 }$ cycle occurs which ensures that the Calvin cycle is occurring at its maximum capacity and there is no wastage.

Complete answer:
${ C }_{ 3 }$ Plants${ C }_{ 4 }$ Plants
The ${ C }_{ 3 }$ pathway or the Calvin cycle takes place in ${ C }_{ 3 }$ plants.The ${ C }_{ 4 }$ pathway or the Hatch and Slack pathway take place along with the ${ C }_{ 3 }$ pathway in ${ C }_{ 4 }$ plants.
Photorespiration is not prevented in ${ C }_{ 3 }$ plants.Photorespiration is prevented in these plants due to the ${ C }_{ 4 }$ pathway taking place.
Photorespiration occurs in ${ C }_{ 3 }$ plants because the first carbon fixation enzyme RuBisCO has oxygenase activity along with carboxylase activity and thus oxidizes the carbon compound instead of fixing the carbon.Photorespiration does not occur in ${ C }_{ 4 }$ plants because the first carbon fixation enzyme PEPcase does not show any oxygenase activity and thus does not oxidize the carbon compound.
The first carbon acceptor in ${ C }_{ 3 }$ plants is Ribulose bis-phosphate (RuBP)The first carbon acceptor in ${ C }_{ 4 }$ plants is Phosphophenol pyruvate (PEP).


Note: -Photorespiration is the process of conversion of RuBP into phosphoglycerate and phosphoglycolate with the utilization of oxygen.
-It is a wasteful process because there is no synthesis of sugar or ATP, but instead, the already fixed carbon dioxide is released with the utilization of ATP.
-The ${ C }_{ 4 }$ plants do not show photorespiration because the ${ C }_{ 4 }$ cycle increases the concentration of carbon dioxide at the site of the RuBisCO enzyme. This is done to ensure that the RuBisCO enzyme does not perform oxygenase activity.