One set of a plant was grown at 12 hours day and 12 hours night period cycle and it flowered while in the other set night period cycles and it flowered while in the other set night phase was interrupted by flash of ligth and did not produce 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 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 this type of plant does not flower, if the dark period is interrupted with flashes of light.