Correct option is B
Explanation of the correct answer:
Cryptochromes are blue light photoreceptors in plants, which are involved in regulating various light-dependent processes, including seed germination, flowering, and circadian rhythm. The chromophore (light-absorbing component) of cryptochromes is derived from Vitamin B2 (riboflavin) and Vitamin B9 (folate).
Vitamin B2 (riboflavin): This is a crucial component of the chromophore in cryptochromes, which absorbs blue light.
Vitamin B9 (folate): This derivative also contributes to the light-sensitive chromophore in cryptochromes, facilitating their light-absorbing properties.
Thus, B2 and B9 are the correct derivatives of the Vitamin B complex that make up the chromophore in cryptochrome.
Additional Information about Incorrect Options:
Option 1 (B3 and B12): This option is incorrect because Vitamin B3 (niacin) and Vitamin B12 (cobalamin) do not form the chromophore in cryptochromes. They are important for other metabolic processes but not for light detection in plants.
Option 3 (B2 and B12): This option is incorrect because while B2 (riboflavin) is part of the chromophore, B12 (cobalamin) is not involved in the formation of the cryptochrome chromophore.
Option 4 (B3 and B9): This option is incorrect because B3 (niacin) is not involved in the cryptochrome chromophore formation. B9 (folate), however, is correctly included in the chromophore.
