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Question
What will be the effect on phytochrome in a plant subjected to continuous red light?
What will be the effect on phytochrome in a plant subjected to continuous red light?
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Solution
The correct option is D Increase and then decrease in levels of phytochrome to remain in equilibrium
Phytochrome is a photo detector pigment in the plant. It is sensitive to the red and far-red region of the visible spectrum. It regulates the flowering. Continuous exposure of red light will lead to the conversion of phytochrome & thus its level will be decreased.
Phytochrome regulates the flowering at 670 nm of light, it changes to Pfr and at 730 nm of light it changes to Pr.
If, we subject a plant to continuous red light, the level of phytochrome in the plant decrease below a critical value and triggers the de novo synthesis of more phytochromes in the Pr form. The result is an equilibrium in the plant between the synthesis and the destruction of phytochrome.
So, the correct answer is option D.
Phytochrome is a photo detector pigment in the plant. It is sensitive to the red and far-red region of the visible spectrum. It regulates the flowering. Continuous exposure of red light will lead to the conversion of phytochrome & thus its level will be decreased.
Phytochrome regulates the flowering at 670 nm of light, it changes to Pfr and at 730 nm of light it changes to Pr.
If, we subject a plant to continuous red light, the level of phytochrome in the plant decrease below a critical value and triggers the de novo synthesis of more phytochromes in the Pr form. The result is an equilibrium in the plant between the synthesis and the destruction of phytochrome.
So, the correct answer is option D.
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