Choose the correct answer from the alternatives given. Light of wavelengths causes phytochrome to switch from inactive to active form whereas light of wavelengths has the opposite effect.
A
red; far-red
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B
far-red; red
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C
red; blue
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D
far-red; blue
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Solution
The correct option is A red; far-red
Phytochrome is receptors of light which are a blue-green pigment and are dependent upon red and far-red light for the process of flowering. The phytochromes are present in two forms:
Active form (Pfr)
Inactive form (Pr)
When the plants are exposed to a red light then phytochromes get activated (Pfr) and the help in the growth of the plant then later when exposed to a far-red light it gets deactivated and becomes inactive form (Pr) thus resulting in the stoppage of flowering.