Question

In short day plants, flowering is inhibited by

• A. Interruption of dark by white or red light
• B. Dark interruption by far red light
• C. Dark interruption by red light followed by far red light
• D. Not possible

Answer 1

Answer: (A)

Interruption of dark by white or red light

Short day plants (SDP) are those plants that begin flowering when the days are shorter than their critical day length. They require a long period of darkness and short period of light to flower. Flash of white or red light in dark thus inhibits flowering in short day plants.

Thus, the correct answer is 'Interruption of dark by white or red light'.