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Question

Certain pigments regulate the process of photoperiodism. The pigments exist in two photochemically inter-convertible forms, operating at two different wavelength of light.
The pigments in question are the:

A
Carotenoids
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B
Xanthophylls
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C
Phytochromes
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D
Chlorophylls
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Solution

The correct option is C Phytochromes
Phytochrome is a plant pigment found in flowering plants that can detect the presence or absence of light. Phytochrome is involved in regulating many processes that are linked to day length (photoperiod) such as seed germination and initiation of flowering i.e., photoperiodism. Phytochrome is sensitive to light in the red and far-red region of the visible spectrum.

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