Phytochrome is a ......

$A$ pigment concerned with both floral induction and seed germination is

During the photoperiodic induction,$........$ is translocated from leaves to shoot buds to induce flowering.

Which of the following is/are example/s of long day plant?
$I.$ Tomato
$II.$ Maize
$III.$ Rice
$IV.$ Radish
Choose the correct option accordingly.

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