Answer: Cell division.
- A Stomatal closure
- B Stem elongation
- C Cell division
- D Fruit ripening
Correct answer: C. Cell division
Explanation: Cytokinins primarily promote cell division (cytokinesis) and also help delay senescence and promote lateral bud growth in plants.
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.