Which of the following mechanisms is in the correct sequence of steps (I-IV as listed below) that takes place during the formation of de-etiolation (greening) response proteins in plants?
I. Detection of light signal
II. Activation of phytochrome
III. Activation of specific protein kinase1
IV. Formation of de-etiolation response protein
A) I, III, II, and IV
B) I, II, III, and IV
C) II, I, III, and IV
D) III, I, II, and IV

B) I, II, III, and IV

Explanation:

De-etiolation is the natural process taking place in the seedlings of the plants when the seedlings grow out from the seed to the above surface also called the greening.

The process of de-etiolation involves the photoreceptors one of which is the phytochromes. The phytochromes are activated in the red and far-red light wavelength as this wavelength changes the conformation of the proteins.

Once the protein conformation changes, the phytochrome becomes activated and the kinase activity takes place which is associated with the phosphorylation of the domains in the phytochromes.

This activates the transcription factor which then proceeds the transcription process followed by translation and the de-etiolation proteins are synthesised.

Thus, Option-B is correct.

a and b