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The MAIN photosynthetic pigment in green plants is:

AChlorophyll a (blue-green, at reaction centres)
BChlorophyll b (yellow-green accessory)
Cβ-carotene (orange-red carotenoid)
DXanthophyll (yellow accessory pigment)
Answer & Solution
Correct answer: A. Chlorophyll a (blue-green, at reaction centres)
Chlorophyll a is the main pigment, present at the reaction centres of PSI + PSII. Chl b, carotenes, xanthophylls are ACCESSORY pigments that transfer absorbed energy to chl a.
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