Question

Flowering in short day plants is induced by

• A. Short days and interrupted long nights
• B. Short days and uninterrupted long nights
• C. Short nights
• D. Long day with interrupted night

Answer 1

Answer: (B)

Short days and uninterrupted long nights

Short day plants are those plants that begin flowering when the days are shorter than their critical day length. They require long period of uninterrupted nights and short period of days to flower. Examples of short day plants are rice, tobacco, cotton. Long day plants are those plants that begin flowering when the days are longer than their critical day length. They will flower when they are exposed to short period of darkness and long period of light.

Thus, the correct answer is option B.