Q. One set of a plant was grown at 12 hours day 12 hours night period cycles and it flowered, while in the other set night phase was interrupted by flash of light and it did not produce flower. Under which one of the following categories will you place this plant?
A) Long day
B) Darkness neutral
C) Day neutral
D) Short day
Explanation
The conditions show that the plant requires photoperiod shorter than the critical day length. This plant needs uninterrupted dark period for flowering. Therefore, it is a short day plant and these plants do not flower if the dark period is interrupted with flashes of light.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.