When flowering is regulated by the length of day and night,it is called

There are many plants that do not show any correlation between exposure to light duration and the induction of flowering. Such plants are called $..........$.

Differentiate between Phototropism and Photoperiodism.

Which technique is employed for the extraction and elimination of hormones?

Differentiate between Photoperiodism and Vernalization.

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