Question:

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

Updated On: Apr 14, 2025

Breakdown of proton gradient
Breakdown of electron gradient
Movement of protons across the membrane to the stroma
Reduction of NADP to NADPH₂ on the stroma side of the membrane

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The Correct Option is B

Solution and Explanation

Chemiosmotic hypothesis explains the mechanism of ATP synthesis in the thylakoids of chloroplast. In photosynthesis, the synthesis of ATP is linked to the development of a proton gradient across the cell membrane. No electron gradient is formed during generation of ATP.

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Concepts Used:

Photosynthesis in Higher Plants

Processes Of Photosynthesis in Higher Plants:

Photosynthesis in higher plants involves the following processes:

Light Reaction
Dark Reaction

Light Reaction:

This phenomenon occurs in the presence of light.
The pigment absorbs light and produces energy in the form of ATP.
The process involves- absorption of light, water splitting, the release of oxygen, and formation of ATP and NADPH.

Dark Reaction:

This process occurs in the absence of light in the stroma of the chloroplasts. The following cycles are involved in the process:

Calvin Cycle (C3 Cycle)
C4 Cycle (Hatch and Slack Pathway)