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Plants that flower only when light lasts longer than a critical time are:
ADay-neutral plants
BNight plants
CLong day plants
DShort day plants
Answer & Solution
Correct answer: C. Long day plants
1. Some plants need light beyond a critical duration.
2. Others need less than it.
3. The first group are long day plants.
_Source: NCERT Class 11 Biology, Chapter 15, Plant Growth and Development._
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