Answer: photoperiodism.
- A photoperiodism
- B vernalisation
- C phototropism
- D dormancy
Correct answer: A. photoperiodism
Explanation: Photoperiodism is the response of flowering to day length.
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.