The name 'phytochrome' was given by

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

Short night plants are known as:

Which of the following statements does not characterize photoperiodism?

$A$ group of plants flowered when exposed to a $12$ hour day and $12$ hour night cycle. Another group of the same plants did not flower when exposed to the same day-night cycle but with a brief light interruption during the night. What type of plants are these?

Which of the following pigments is present in two forms?