The term "photoperiodism" was proposed by, or the phenomenon of photoperiodism in plants was discovered by:

During vernalisation,the stimulus of low temperature is perceived by

When the dark period of short-day plants is interrupted by a brief exposure of light,then the plant:

Given below are two statements.
Statement $I$: If the long dark period is interrupted by a brief flash of light,short day plants will not flower.
Statement $II$: When the long dark period is interrupted by a brief flash of light,long day plants can flower.
In the light of above statements,choose the most appropriate answer from the options given below:

Nicotiana tabacum,a short-day plant,when exposed to more than the critical period of light,fails to flower. Explain.

Phytochrome becomes active in