A set of plants when grown at 14 hours day length, they flowered, but when the same type of plant are grown at 9 hours day length, they do not flowered. The plant is
Long day plant
Long short day plant
Short day plant
Day neutral plant
Long day plants (LDP) -
Flower when they receive long photoperiods or light hours which are above critical lenght.
- wherein
Eg. Wheat, oat, sugar, beet, spinach, radish, barley, lettuce