Question

Flowering in short day plant is induced by
A. Short day and interrupted long nights
B. Short day and uninterrupted long nights
C. Short day
D. Long day with interrupted nights

Answer 1

Flowering is induced by photoperiods. Short day plants are the plants which flower when the photoperiod is shorter. Example tobacco.

Complete step by step answer:
To solve this question we must know about the short day plants.
Photoperiodism is the response of an organism towards the light and dark periods. It occurs in plants and animals. Photoperiodism affects flowering by inducing the shoot to produce flower buds. The response is controlled by photoreceptor proteins like phytochrome. They are classified as short day, long day and day neutral plants.
Long day plants- These are the plants which require longer days for flowering. Plants flower during early summer. Example- Pea.
Short day plants are the plants which require shorter days or long nights for flowering. The plants flower during winters. Short day plants flower when the length of the day is less than 12 hours. They require continuous periods of darkness for flowering. Example-cotton, rice.
Day neutral Plants- the plant in which flowering is unaffected by the photoperiod or the length of the day and night. Example-roses, tomatoes.

The correct answer is (B). Short day require short day an uninterrupted long nights.

Note:
Photoreceptors are very important for photoperiodism. These photoreceptors sense the seasonal changes according to the day time and night time and give signals to the plant for flowering.