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Q.

Which one among the following is not an accessory pigment?

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a

Chlorophyll b

b

Xanthophyll

c

Carotene

d

P680

answer is D.

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Detailed Solution

P680 is a specialised form of chlorophyll a present in the reaction center of PSII. Reaction center chlorophyll a molecules are directly involved in photosynthesis by directly ejecting electrons. Hence they are not accessory pigments. Pigments that do not form the reaction center but present in light harvesting complex are called accessory pigments. 

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