Assertion (A): The number of ATP molecules synthesised depends on the nature of electron donor.
Reason(R): Oxidation of NADH gives rise to 2ATP while that of FADH₂produces 3 molecules of ATP.

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Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

(A) is true but (R) is false

Both (A) and (R) are true and (R) is not the correct explanation of (A)

answer is C.

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Detailed Solution

(A) is true but (R) is false

Assertion (A) is true. The number of ATP molecules synthesized during cellular respiration depends on the source of electrons donated to the electron transport chain (ETC). Different electron carriers, such as NADH (Nicotinamide Adenine Dinucleotide) and FADH₂ (Flavin Adenine Dinucleotide), donate electrons to the ETC at different stages. The flow of electrons through the ETC ultimately leads to the pumping of protons (H⁺) across the inner mitochondrial membrane and the establishment of an electrochemical gradient, which is then used to drive ATP synthesis.

Reason (R) is false. During oxidative phosphorylation, each NADH molecule contributes enough energy to synthesize about 3 ATP molecules. During oxidative phosphorylation, each FADH2 molecule contributes enough energy to synthesize about 2 ATP molecules.

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