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Question

Which fractions of the visible spectrum of solar radiations are primarily absorbed by carotenoids of the higher plants?


A
Blue and green
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B
Green and red
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C
Red and violet
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D
Violet and blue
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Solution

The correct option is D Violet and blue
Carotenoids absorb light in the blue and violet region and reflect the longer yellow, red, and orange wavelengths and hence the pigments appear yellow or brown to reddish.
Chlorophyll a absorbs light in the blue-violet region, while chlorophyll b absorbs red-blue light. Neither a or b absorb green light. Green light is reflected and hence chlorophyll appears green in colour.

Biology

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