NEET Questions Solved


Phytochromes play a role in 

(1) seed germination

(2) flowering 

(3) photomorphogenesis

(4) photosynthesis.

(2) Phytochrome is a bright blue or bluish green receptor pigment found in higher green plant and is associated with flowering. It occurs in two interconvertible forms — 

(i) P660 — It has a light absorption peak in red light. It is stimulatory to flowering in short day plants and inhibitory to flowering in long day plants. 

(ii) P730 — It has a light absorption peak in far-red. This form is inhibitory to flowering in short day plants and stimulatory to flowering in long day plants. 

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