A plant protein is known as ........... that involved in the phenomenon of photoperiodism.

Phytochrome

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Carotene

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Chlorophyll

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Xanthophyll

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Solution

The correct option is B Phytochrome
Phytochrome is a protein plant pigment which serves to direct the course of plant growth and development. It helps in response related to photoperiodism. It exists in two forms Pr and Pfr.
So, the correct answer is option A.

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