The phytochrome was discovered by

Define/Explain: Day-neutral plant.

$A$ 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?

Photoperiodism affects

The response of different organisms to the environmental rhythms of light and darkness is called

The pigment phytochrome is involved in: