One plant group kept for 12 hrs in day and 12 hrs in night and flowering is observed in it. Another plant group is kept similarly for day - night period and for very short time light is given during dark period it do not flower. What is such type of plant called ? (CBSE 2004)

One plant group kept for 12 hrs in day and 12 hrs in night and floweri

1.	One plant group kept for 12 hrs in day and 12 hrs in night and flowering is observed in it. Another plant group is kept similarly for day - night period and for very short time light is given during dark period it do not flower. What is such type of plant called ? (CBSE 2004)
A.	Long-day plant
B.	Day-neutral plants
C.	Medium-day plants
D.	Short-day plants
Answer» E.