Here you will get Complete Photosynthesis in Higher Plants NEET Previous Year Questions with complete and detailed solutions.
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Get complete NEET previous year questions for Physics, Chemistry and Biology.
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Shreeya Amol Bele
Dec. 8, 2024, 6:35 a.m.
The correct answer is:
c) quinone
Explanation:
In the light-dependent reactions of photosynthesis, the sequence of electron transport begins when chlorophyll molecules in Photosystem II (PSII) become excited by light energy. The process is as follows:
1. Excitation of PSII:
Light energy excites electrons in the chlorophyll molecules of PSII.
2. Primary Electron Acceptor:
The excited electrons are transferred to a primary electron acceptor, which is plastoquinone (PQ), a quinone molecule.
3. Electron Transport Chain:
The electrons are then passed through the cytochrome b6f complex and eventually reach Photosystem I (PSI) via plastocyanin.
Why Other Options Are Incorrect:
a) Cytochrome a: Not part of the PSII electron transport chain.
b) Cytochrome b: Part of the cytochrome b6f complex but does not directly accept electrons from PSII.
d) Ferredoxin: Accepts electrons from Photosystem I, not PSII.
Thus, quinone is the first molecule to accept electrons from excited chlorophyll in PSII.