A) Long day
B) Darkness neutral
C) Day neutral
D) Short day
Correct Answer: D
Solution :
The conditions show that the plant require 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. Long day plants require light period of 14-16 hours for subsequent flowering. The distinctive feature of long day plant is that long night period entirely prevent flowering but long nights interrupted by light, even briefly, cause the inhibitive effect of the night to be lost and the plants flowers. Day neutral plants flower in all photoperiods ranging from 5-24 hrs. In these plants, floral initiation is independent of photoperiodism.
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