Question:

In photosystem-I, the first electron acceptor is :

Updated On: Jun 23, 2024

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)