Question

The minimum length of the day or photoperiod required to induce flowering in a plant is called its .

• A. photoperiodism
• B. critical day length
• C. vernalisation
• D. critical dark length

Answer 1

The correct option is B critical day length

The minimum length of day or light period or photoperiod required to induce flowering in a plant is called its critical day length. The criritcal day length is specific for each species. Some plants require the exposure of light for a period exceding critical day length (long day plants) while others require less than critical day length (short day plants).