Question

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

Answer 1

Nicotiana tabacum is a short day plant. It flowers when the photoperiod or day length is below a critical period. Actually, Nicotiana tabacum requires a continuous critical dark period for flowering. It will not flower if continuous critical dark period is broken by a brief period of light.