Question:
Energy required for $ATP$ synthesis in$PS II$ comes from
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
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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.
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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)