Question

Light energy is not used directly or indirectly in which of the following option?

• A. Splitting of $H_{2}O$
• B. To develop proton gradient during photophosphorylation
• C. ${CO}_2$ reduction in dark reaction
• D. To develop proton gradient during oxidative photophosphorylation

Answer 1

The correct option is D To develop proton gradient during oxidative photophosphorylation

NADH and FADH${}_2$ transfer their electrons to molecules near the beginning of the transport chain. As electrons are passed down the chain, they move from a higher to a lower energy level, releasing energy. Some of the energy is used to pump H${}^{+}$ ions, moving them out of the matrix and into the intermembrane space. The energy released in these reactions is captured as a proton gradient, which is then used to make ATP in a process called chemiosmosis. Together, the electron transport chain and chemiosmosis make up oxidative phosphorylation.

So, the correct option is 'To develop proton gradient during oxidative photophosphorylation'.