Vernalisation can be reversed by

Garner and Allard have worked on

Photoperiodism was first studied by

In short day plants $(SDP)$,flowering is induced by

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

In some plants, flowering depends on the relative duration of light and dark periods. This response of plants to periods of day/night is called $......$.