Question:

Energy required for $ATP$ synthesis in$PS II$ comes from

Updated On: Jul 6, 2022

proton gradient
electron gradient
reduction of glucose
oxidation of glucose

Hide Solution

Verified By Collegedunia

The Correct Option is A

Solution and Explanation

Photosystem $II (PS II)$ is a photosynthetic pigment system alongwith some electron carriers that is located in the appressed part of the grana thylakoids. $PS II$ has chlorophyll $a$, chlorophyll $b$ and carotenoids. It picks up electron released during photolysis of water. The same is extruded on absorption of light energy. As the extruded electron passes over cytochrome $b_{6}-f$ complex, it energises passage of protons picked up by $PQ$ to create protons gradient for synthesis of $ATP$ from $ADP$ and inorganic phosphate. This photophosphorylation is non-cyclic.

Was this answer helpful?

Notes on Photosynthesis in higher plants

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)