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🔬 Biology  ·  Plant Growth and Development  ·  NEET

Plants that flower only when the day length is shorter than a critical value are:

Answer: short-day plants.

  • A short-day plants
  • B long-day plants
  • C day-neutral plants
  • D aquatic plants

Correct answer: A. short-day plants

Explanation: Short-day plants flower when nights are long (days short).

Geometric Growth: the Sigmoid Curvetimegrowthlag phaselog/exponential phasestationary phaseGrowth starts slow, accelerates rapidly, then plateaus as resources become limiting

Geometric growth (where both daughter cells keep dividing) produces this classic S-shaped curve: a slow lag phase, a rapid exponential phase, and a levelling-off stationary phase as nutrients or space become limiting - the same fundamental pattern seen in population growth.

Concept context

Phases of plant growth, the five classical plant hormones plus newer ones, photoperiodism, vernalization, and seed dormancy.

Read the full Plant Growth and Development notes →