One set of a plant was grown at 12 hours day and 12 hours night period cycles and it flow- ered while in the other set night phase was interrupted by flash of light and it did not pro- duce flower. Under which one of the following categories will you place this plant ?

Options

A. Long-day
B. Darkness neutral
C. Day neutral
D. Short-day

Answer

D

Explanation

The condition shows that the plant require photo-period shorter than the critical day length. This plant needs uninterrupted dark period for flowering. Therefore, it is a short-day plant and these do not flower if the dark period is interrupted with flashes of light