Answer: Induces stomatal closure and seed dormancy under stress like drought.
- A Induces stomatal closure and seed dormancy under stress like drought
- B Stimulates internode elongation within the stem under usual circumstances
- C Promotes faster cell division in favourable conditions as generally observed
- D Speeds up fruit ripening together with ethylene in typical laboratory settings
Correct answer: A. Induces stomatal closure and seed dormancy under stress like drought
Explanation: Abscisic acid (ABA) is associated with plant stress responses; it promotes stomatal closure during water stress and induces seed and bud dormancy, generally acting as a growth inhibitor.
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.