For flowering,the critical dark period should always be exceeded in

Differentiate between Photoperiodism and Vernalization.

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 $......$.

One set of a plant was grown at $12$ hours day and $12$ hours night period cycles and it flowered,while in the other set,the night phase was interrupted by a flash of light and it did not produce flowers. Under which one of the following categories will you place this plant?

Vernalisation can be reversed by

Which of the following statements are $INCORRECT$ with respect to phytochrome?
$i$. Phytochrome is a light-receiving proteinaceous pigment present in the leaves of plants.
$ii$. Phytochrome pigment exists in two forms.
$iii$. Two forms of phytochromes are interconvertible.
$iv$. Phytochromes are located in the chloroplast of green cells.
$v$. Phytochrome $P_r$ form inhibits flowering in $LDP$ during the dark period.