Topic: Light reactions, cyclic and non-cyclic photophosphorylation, chemiosmosis· Plant Physiology

Which one of the following is not true regarding the release of energy during ATP synthesis through chemiosmosis ? It involves :

1. Reduction of NADP to NADPH\(_2\) on the stroma side of the membrane

2. Breakdown of proton gradient

3. Breakdown of electron gradient

4. Movement of protons across the membrane to the stroma

Doubtly Asked 30 Oct 2026 NEET UG 2022 Practice test neet Save WhatsApp Report

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Answer: 3. Breakdown of electron gradient

In chemiosmosis, a proton gradient (not an electron gradient) drives ATP synthesis.

Protons move across the membrane to the stroma through ATP synthase, the proton gradient breaks down releasing energy for ATP, and NADP is reduced on the stroma side. There is no "breakdown of electron gradient", so option 3 is not true.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Which one of the following is not true regarding the release of energy during ATP synthesis through chemiosmosis ? It involves :

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