Assertion :Presence of photorespiration is considered as a wasteful and energy consuming process in crop plants, ultimately leads to reduction in yield. Reason: During $C_{3}$ synthesis upto $50$ % $C O_{2}$ fixed may have to pass through photosynthesis process to form carbohydrate such as sucrose.

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.
Photorespiration is a process that occurs in C $_{3}$ plants when there is high O $_{2}$ concentration. RuBisCO instead of binding with CO $_{2}$ binds with O $_{2}$ and forms one molecule of phosphoglycerate and phosphoglycolate in a pathway called photorespiration. So there is neither synthesis of sugars, nor of ATP. Instead, CO $_{2}$ is released with the utilization of ATP. Photosynthetic yield is reduced in such plants due to photorespiration. Hence, the assertion is correct.
It is estimated that during C $_{3}$ pathway of CO $_{2}$ fixation, 50% of CO $_{2}$ have to pass through photosynthesis to form carbohydrate molecule such as sucrose. Thus, in C $_{3}$ plants photosynthesis is inefficient. Hence, the reason is correct.
So, both assertion and reason are correct and the reason is the correct explanation for the assertion.

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Assertion :Presence of photorespiration is considered as a wasteful and energy consuming process in crop plants, ultimately leads to reduction in yield. Reason: During C3 synthesis upto 50% CO2 fixed may have to pass through photosynthesis process to form carbohydrate such as sucrose.

Assertion :Presence of photorespiration is considered as a wasteful and energy consuming process in crop plants, ultimately leads to reduction in yield. Reason: During $C_{3}$ synthesis upto $50$ % $C O_{2}$ fixed may have to pass through photosynthesis process to form carbohydrate such as sucrose.