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- #National Eligilibility Cum Entrance Test
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Plants have evolved with multiple photoreceptors, which can perceive specific wavelengths of light. Which one of the following statements is correct about the photoreceptors?
Phytochrome A can perceive far red and blue light.
Phytochrome C can perceive far red light.
Cryptochrome 1 and phytochrome B are responsible for perceiving blue light.
Phytochrome B can predominantly perceive far red light.
Answers (1)
Phytochrome A is a photoreceptor protein found in plants that can absorb light in the far red (700-750 nm) and blue (400-500 nm) regions of the electromagnetic spectrum. It exists in two forms: Pr (inactive) and Pfr (active), and undergoes a reversible conversion between these forms when exposed to light.
When phytochrome A absorbs far red light, it is converted from the Pr form to the Pfr form. This conversion is responsible for various physiological responses in plants, such as inhibition of stem elongation and induction of seed germination. On the other hand, exposure to blue light can trigger the conversion of Pfr back to Pr.
Hence, the correct answer is option 1.
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