Answer: Requirement for cold treatment to induce flowering.
- A A plant's photoperiodic response to the relative length of day versus night
- B Requirement for cold treatment to induce flowering
- C Application of elevated temperature treatment to accelerate vegetative growth
- D Prolonged exposure to drought stress that triggers stomatal closure
Correct answer: B. Requirement for cold treatment to induce flowering
Explanation: Vernalization: plants require prolonged cold treatment (winter) to acquire the ability to flower in spring. Promotes flowering in wheat, barley.
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.