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  4. Assertion: In C4 plants, photorespiration does not occur. Reason: C4 plants have a mechanism that increases the concentration of CO2 at the enzyme site.

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Q. Assertion: In $C_{4}$ plants, photorespiration does not occur.
Reason : $C_{4}$ plants have a mechanism that increases the concentration of $CO_{2}$ at the enzyme site.

Photosynthesis in Higher Plants

Solution:

In $C_{4}$ plants photorespiration does not occur because they have a mechanism that increases the concentration of $CO_{2}$ at the enzyme site. This takes place when the $C_{4}$ acid from the mesophyll is broken down in the bundle sheath cells to release $CO_{2}$. This results in increasing the intracellular concentration of $CO_{2}$. This ensures that the $RuBisCO$ functions as a carboxylase, thus, minimising the oxygenase activity.