Question

Define sdp and ldp.give one example of each

Answer 1

*Short day plants are the plants which start flowering before the criticalday-length. The duration of exposure is between 9-16 hours.
*Long day plants are the plants which start to flower when the days arelonger than the critical day- length. The duration of exposure is more than 16 hours.
*Day-neutral plants are the plants which flower independent of their day-length. They will flower in the photoperiod which is neither too long nor too short.

Examples:*Short day plants : Rice, Chrysanthemum, Cotton, Tobacco, Poinsettias,Soyabeans etc.
*Long day plants : Spinach, Radish, Lettuce, Sugar beet etc.
*Day-neutral plants : Tomatoes, Sunflower, Pea plants, Common bean, Maize Dandelions etc.

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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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