Define/Explain: Day-neutral plant.

The stimulus for flowering is perceived by which part of the plant?

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:

Which of the following pairs is mismatched?

Phytochrome is a ......

Give scientific reasons: Some plants flower in summer and some flower in winters.