SSC
BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In the summer when days are long and Pfr is high
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In the winter when days are short and Pfr is high
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In the winter when days are short and Pfr is low
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In the winter when days are long and Pfr is high
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Detailed explanation-1: -They bloom naturally under the long night conditions of winter, so it is easy for nurseries to bring them into color in time for winter holidays. The beauty of poinsettias can persist from Thanksgiving through Christmas, and sometimes even to Valentine’s Day.
Detailed explanation-2: -Poinsettias will classically drop their leaves if they are exposed to sudden changes in temperature, drafts or overly cool or dry rooms. They also will lose leaves and wilt in response to an extreme need for water. When choosing a plant, pick a healthy, full one with no discoloration on the foliage.
Detailed explanation-3: -To restore healthy green plants into their original show-stopping colour in time for Christmas you need to keep plants in total darkness, for 14 hours each day for up to eight weeks to trick them into thinking winter has come early.