A) Blue light
B) Green light
C) Red light
D) None of the above
Correct Answer: C
Solution :
Phytochrome occurs in two i.e., Pr. (Red light) and Pfr. (for red light) and both are interconertible. It is considered that during long time Pfr form accurnulates in plants which is inhibitory to flowering in SDP during night Pr form accumulates in plants which is stimulatory to flowering.
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