Question:
In photosystem-I, the first electron acceptor is :
In photosystem-I, the first electron acceptor is :
Updated On: Jun 15, 2026
- ferredoxin
- cytochrome
- plastocyanin
- an iron-sulphur protein
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The Correct Option is D
Solution and Explanation
Photosystem I contains a complex of proteins and pigments that capture and transfer electrons during the light-dependent reactions of photosynthesis. The first electron acceptor in PS I is an iron-sulfur protein that receives electrons from the reaction center chlorophyll molecule. These electrons are then transferred through a series of carriers, including ferredoxin and eventually contribute to the reduction of NADP+ to NADPH.
So, the correct option is (D): an iron-sulphur protein
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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)