In Krebs' cycle, the FAD precipitates as electron acceptor during the conversion of succinic acid to fumaric acid.

(A)fumaric acid to malic acid
(B)succinic acid to fumaric acid
(C)succinyl CoA to succinic acid
(D)α-ketoglutarate to succinyl CoA

The NCERT line that answers it

Verbatim line

Complex II (Succinate dehydrogenase):** Located in the inner membrane. It receives electrons from Succinate (oxidized to Fumarate) and transfers them to Ubiquinone (UQ). It does not pump protons. The internal components are Fe-S and FAD.

Chapter: Respiration in Plants
Section: 12.4.2 Electron Transport System (ETS) and Oxidative Phosphorylation

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=0.8866, combined=0.932). Verified: high — The span explicitly states that Complex II (Succinate dehydrogenase) receives electrons from Succinate (oxidized to Fumarate) and contains FAD, which directly matches the MCQ's claim about FAD acting as electron acceptor during succinic acid to fumaric acid conversion.

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