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The reaction centre of Photosystem I is
ACytochrome c with peak at 555 nm
BP700 chlorophyll a with peak at 700 nm
CP680 chlorophyll a with peak at 680 nm
DP800 carotenoid with peak at 800 nm
Answer & Solution
Correct answer: B. P700 chlorophyll a with peak at 700 nm
PS I reaction centre = P700 (chl a absorbing maximally at 700 nm). PS II reaction centre = P680 (chl a absorbing at 680 nm). The numbering reflects discovery order, not functional sequence (water-side PS II precedes PS I).
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