Assertion (A) : $C_{4}$ plants lack a process called photorespiration
Reason (R) : In bundle sheath cells $C_{4}$ plants RuBiSCO is present but PSII is absent

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If both A & R are false

If A is true, but R is false

If both A and R are true, and the R is the correct explanation of the A

If both A and R are true, and the R is not the correct explanation of the A

answer is A.

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Detailed Solution

In C4 plants photorespiration does not occur. This is because they have a mechanism that increases the concentration of CO2 at the enzyme site. This takes place when the C4 acid from the mesophyll is broken down in the bundle sheath cells to release CO2 – this results in increasing the intracellular concentration of CO2 . In turn, this ensures that the RuBisCO functions as a carboxylase minimising the oxygenase activity.

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