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

Most of the winter flowering plants belong to

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?

Vernalization stimulates flowering in

What will be the effect on phytochrome in a plant subjected to continuous red light?

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