Which treatment is effective in the red-far red light response of plants?

Some plants require a period of light greater than a critical duration for flowering. Such plants are called $..............$.

The proteinaceous pigment that acts as the center of activities concerned with light is:

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.

Vernalization is done at

Given below are two statements.
Statement $I$: If the long dark period is interrupted by a brief flash of light,short day plants will not flower.
Statement $II$: When the long dark period is interrupted by a brief flash of light,long day plants can flower.
In the light of above statements,choose the most appropriate answer from the options given below: