One set of a plant was grown at 12 hours a day and 12 hours night period cycles and it flowered while in the other set night phase was interrupted by a flash of light and it did not produce a flower. Under which one of the following categories will you place this plant?
The condition shows 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 do not flower if the dark period is interrupted by flashes of light.