Long day plants produces flowers when they are exposed to | Filo
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Class 11

Biology

Plant Physiology

Plant Growth and Development

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Long day plants produces flowers when they are exposed to

  1. Any duration of light
  2. Light period longer than a critical day length
  3. Light period longer than 12 hrs
  4. None of the above
Correct Answer: Option(b)
Solution: Photoperiodism can also be defined as the developmental responses of plants to the relative lengths of light and dark periods. When the plants require exposure to the daylight greater than the critical day length for flowering, then the plants are known as log day plants. 
Thus, the correct answer is option B. 
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