Question

In short day plants, flowering is induced by
(a) photoperiod less than 12 hours
(b) photoperiod below a critical length and
uninterrupted long night
(c) long night
(d) short photoperiod and interrupted long night

Answer 1

Flowering in short-day plants:

• Option “B” is correct i.e. photoperiod below a critical length & uninterrupted long night.

• Flowering in short-day plants is induced by photoperiod below a critical length and uninterrupted long night.

• Short day plants are those plants that start flowering when the photoperiod is smaller than their critical day length. They need continuous long night and the short periods of light to flower.  

Hope it helped....

Answer 2

Explanation:

(b) photoperiod below a critical length and

uninterrupted long night