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Within a photosystem, the reaction centre is formed by

(a) a carotenoid molecule Your answer
(b) a chlorophyll b molecule Your answer
(c) a single chlorophyll a molecule Correct
(d) a molecule of ferredoxin Your answer

Your answer: Correct answer: (c)

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Explanation

Why (c) is correct

The reaction centre of each photosystem is a single chlorophyll a molecule.

Why the other options are wrong

(a) · your answer Carotenoids are antenna pigments.
(b) · your answer Chlorophyll b is an antenna pigment.
(d) · your answer Ferredoxin is an electron carrier after PS I.

NCERT point: PS I: P700; PS II: P680; both are chlorophyll a.

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