Assertion :In $C_{4}$ plants, photo respiration does not occur. Reason: $C_{4}$ plants have a mechanism that increases the concentration of $C O_{2}$ at the enzyme site.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
In $C_{4}$ plants photorespiration does not accur because they have a mechanism that increases the concentration of $C O_{2}$ 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 $C O_{2}$ .This results in increasing the intracellular concentration of $C O_{2}$ .This ensures that the RuBisCO functions as a carboxylase, thus, minimising the oxygenase activity. So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.

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

Assertion :In $C_{4}$ plants, photo respiration does not occur. Reason: $C_{4}$ plants have a mechanism that increases the concentration of $C O_{2}$ at the enzyme site.