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Question

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:
  1. Active form (Pfr)
  2. 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.
So, the correct option is 'Red; far-red'.

1161068_852781_ans_8267b56a6749400a82d2bcb5e7ed80a8.jpg

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