Question

A horticulturalist kept tobacco plants in short day conditions during the long day season. State its effect on flowering specifying the reason.

Answer 1

Tobacco plants are short day plants.They require less day and more night periods to bloom.The dark period has to be around 14-16 hours .The plant flowers on receiving the critical dark period.So they are called short -day plants.
It will bloom only when that limit of dark period is reached.So when the tobacco plant got the critical period of darkness , its leaves produce certain chemicals which will bring flowering of the plant.