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MHT CET Medical202621 April 2026Evening ShiftBiologyRespiration in PlantsActual

In the ETS, electrons from FADH ₂ enter into which complex?

Options

  1. AComplex I
  2. BComplex II
  3. CComplex III
  4. DComplex IV

Correct answer

B. Complex II

Step-by-step solution

In the electron transport system (ETS), electrons from NADH are oxidized by Complex I (NADH dehydrogenase). Electrons from FADH ₂ are oxidized by Complex II (succinate dehydrogenase). Therefore, electrons from FADH ₂ enter the ETS through Complex II. Answer: Complex II

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