PLANTS
PLANT REPRODUCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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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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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: -Red light from the sun converts the chromoprotein into Pfr (active form), so plants grow towards the sunlight. It stimulates the growth of the plant. Plants grow slowly in shade as soon as the dormant form (Pr) is produced. When a seed experiences light with the help of the phytochrome system, it germinates.
Detailed explanation-3: -Flowering In Long-Day and Short-Day Plants The principal agent in controlling the flowering process is the pigment phytochrome. This control is carried out through signals.
Detailed explanation-4: -A low phytochrome photoequilibrium (Pfr/Ptot), attained by a far-red irradiation at the close of long days under fluorescent light, also promotes flowering.
Detailed explanation-5: -Phytochromes are red-light photoreceptors that undergo reversible photoconversion between a red-light-absorbing state (Pr) and a far-red-light-absorbing state (Pfr), and thereby they regulate a wide range of physiological responses in plants, fungi, and photosynthetic bacteria (1–5).