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

Examples of plants which require vernalization is/are:

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 increases the resistance of plants for diseases caused by . . . . . . .

The phenomenon where flowering is dependent on exposure to low temperatures is known as:

Through their effects on plant growth regulators,what do the temperature and light control in the plants?