Question

The flowering plants which require the photoperiod less than their critical day length for flowering are called as :-

• A. $\text{LDP}$
• B. $\text{SDP}$
• C. $\text{DNP}$
• D. None of the above

Answer 1

The correct option is B $\text{SDP}$

Plants require the exposure to light for a period exceeding a well-defined critical duration, while others must be exposed to light for a period less than this critical duration before the flowering is initiated in them.

Short day plants are those plants that begin flowering when the days are shorter than their critical day length. They require long period of darkness and short period of light to flower.

Long day plants are those plants that begin flowering when the days are longer than their critical day length.

The critical duration is different for different plants. There are many plants, however, where there is no such correlation between exposure to light duration and induction of flowering response; such plants are called day-neutral plants.


Short day plants will flower when they are exposed to short period of darkness and long period of light. Long day plants flower in summer and short day plants flower in spring.
Thus, the correct answer is option D.