Question

Assertion :C4 pathway of CO${}_2$ fixation is found in some tropical plants. Reason: In this pathway, oxaloacetic acid is the first stable compound.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
• C. Assertion is correct but Reason is incorrect.
• D. If the assertion is false but the reason is true.

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

Corn, sugar cane, crabgrass, and other tropical plants that can grow in hot, dry environments, the CO${}_2$ fixation is done with the help of C${}_4$ pathway to avoid the rate of the slowness of photosynthesis.

The primary CO${}_2$ acceptor is phosphoenol pyruvate and first, the stable product formed is oxaloacetic acid (OAA) which is a 4-C compound. Therefore, option B is the correct answer.