HORTICULTURE

Detailed explanation-1: -A plant that requires a long period of darkness is termed a “short-day” (long-night) plant. Short-day plants form flowers only when day length is less than about 12 hours. Many spring-and fall-flowering plants are short-day plants, including chrysanthemums, poinsettias and Christmas cactus.

Detailed explanation-2: -Green grams, marijuana, cotton, soyabean, jowar and rice are examples of short day plants. Wheat, henbane, carnation, lettuce, barley and oats are the example of long day plants.

Detailed explanation-3: -The flowering response in short-day plants and long-day plants is dependent on the duration for which these plants are exposed to light. The short-day plant and long day plant can flower at the same place, provided they have been given an adequate photoperiod.