Given below are two statements. One is labelled Assertion (A) and the other is labelled Reason (R).
Assertion (A): The role of oxygen is limited to the terminal stage of aerobic respiration but is vital.
Reason (R): Oxygen acts as the terminal electron acceptor, but its presence is essential for the kerbs cycle.
In light of the above statements, choose the correct answer from the options given below.

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Both A and B are false.

Both A and R are true and R is the correct explanation of A.

Both A and R are true but R is not the correct explanation of A.

A is true but R is false

answer is A.

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Detailed Solution

Assertion (A) is true because oxygen acts as the final electron acceptor in the electron transport chain (ETC), where it combines with electrons and protons to form water. It drives the entire process of electron transport.
Reason (R) is true. In the Krebs cycle, oxygen is indirectly involved as it serves as the ultimate electron acceptor in the ETC. The Krebs cycle relies on the continuous supply of NADH and FADH₂, which are generated during earlier stages of aerobic respiration, and the final oxidation of these electron carriers in the ETC requires oxygen. Therefore, the presence of oxygen is crucial for the proper functioning of both the Krebs cycle and the terminal stage of aerobic respiration.

Assertion (A) and Reason (R) are both true, and Reason (R) is the correct explanation of Assertion (A).

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