Question

Define a short day plant, a long day plant and a day neutral plant, giving one example for each.

Answer 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.

Answer 2

HÈLLØ!!

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⭕Long day plants (LDP) :

➖These plants flower when the days are longer.

➖They require more than the critical duration of light to flower (usually 14-16 hours).

➖The light period is very critical in LDP plants.

➖Prolongation of the light period or a brief exposure to light during the dark period boosts flowering in these plants.

➖One usually does not find LDP plants in places where the length of a day is too short.

➖They are also called ‘Short Night Plants’.

➖Examples – spinach, radish, hibiscus etc.

⭕Short Day Plants (SDP) :

➖These plants flower when the days are shorter.

➖They need less than the critical duration of light (about 8-10 hours) and a continuous dark period (about 14-16 hours) to flower.

➖The dark period is very critical for SDP plants and has to be continuous.

➖These plants will not flower if the dark period is briefly interrupted by light.

➖SDP plants are usually not found in places where the length of a day is too long.

➖They are also called ‘Long Night Plants’.

➖Examples – soybean, tobacco, chrysanthemum etc.

⭕Day Neutral Plants (DNP) :

➖These plants do not follow this restriction of critical duration.

➖In other words, they are ‘neutral’ to the length of day or night.

➖Examples – tomatoes, pea plants, rose etc.

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THÅÑKẞ!!