Answer: plant hormones.
- A plant hormones
- B only enzymes
- C simple vitamins
- D soil minerals
Correct answer: A. plant hormones
Explanation: Plant hormones (growth regulators) control growth and development.
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.