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Q.

The first action spectrum obtained by T.W. Engelmann roughly resembled the absorption spectra of 

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a

chlorophyll a and chlorophyll b

b

chlorophyll a and xanthophyll

c

carotenoids and phycobilins

d

xanthophyll and carotene

answer is D.

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Detailed Solution

The first action spectrum obtained by T.W. Engelmann roughly resembled the absorption spectra of chlorophyll a and chlorophyll b which showed high photosynthetic activity or release of oxygen at blue and red lights.

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