alleryAuxin is a plant hormone that mainly promotes:
ACell division at meristems
BCell elongation in stems
CStomatal closure
DRipening of fruits
Answer & Solution
Correct answer: B. Cell elongation in stems
1. AUXIN: produced at shoot tips; promotes cell ELONGATION just below the tip.
2. Mediates phototropism by redistributing to the shaded side.
3. Other plant hormones: gibberellins (stem growth), cytokinins (cell division), abscisic acid (close stomata), ethylene (ripening).
_Source: syllabus Science Ch 6 §6.3.1 Plant Hormones_
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