SSC
BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What controls the flowering process in long-day plants?
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Pfr is converted by red light to Pr which acts as a promoter of flowering.
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Pr is converted by red light to Pfr which acts as an inhibitor of flowering.
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Pr is converted by red light to Pfr which acts as a promoter of flowering.
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Pfr is converted by red light to Pr which acts as an inhibitor of flowering.
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Explanation:
Detailed explanation-1: -1: Phytochrome system: The biologically-inactive form of phytochrome (Pr) is converted to the biologically-active form Pfr under illumination with red light. Far-red light and darkness convert the molecule back to the inactive form. The phytochrome system acts as a biological light switch.
Detailed explanation-2: -Abstract. Phytochromes are red-light photoreceptors that regulate light responses in plants, fungi, and bacteria by means of reversible photoconversion between red (Pr) and far-red (Pfr) light-absorbing states.
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