BIOLOGY
HORMONES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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16 hours light/8 hours dark
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14 hours light/10 hours dark
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15.5 hours light/8.5 hours dark
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4 hours light/8 hours dark/4 hours light/8 hours dark
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Detailed explanation-1: -So, the correct option is ‘14 hours light/10 hours dark’.
Detailed explanation-2: -When flowering in long-day plants is prevented due to dark period length, it is called critical night length. Thus, plants with a dark phase below 9 hours would flower first.
Detailed explanation-3: -The light period which is essentially required to induce flowering in plants is known as critical photoperiod. A long day plant will only flower when the light period is longer than a critical number of hours. Spinach, lettuce, and some varieties of wheat are long-day plants.
Detailed explanation-4: -Short Day Plants (SDP) 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.
Detailed explanation-5: -Long day plants require a light period of 14-16 hour for subsequent flowering. The quality of those plants is that a long night period entirely prevents flowering.