Auxins inhibit the growth of:
Correct answer: B. Lateral buds
- A. Apical buds
- B. Lateral buds
- C. Parthenocarpy
- D. Root growth
Explanation
Auxins are plant hormones that play a crucial role in regulating plant growth processes. They are primarily known for promoting the growth of the apical bud while inhibiting the growth of lateral buds, a phenomenon known as apical dominance. This is why they inhibit the growth of lateral buds, as the plant directs more resources to the elongation of the main stem. In contrast, auxins promote root growth at low concentrations and can encourage parthenocarpy in some plants. Therefore, the correct answer is that auxins inhibit the growth of lateral buds.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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About Plant Growth Regulators
Plant growth regulators are chemical messengers that control growth, development and responses to the environment. The topic covers auxins, gibberellins, cytokinins, abscisic acid and ethylene, including cell elongation, apical dominance, tropisms, seed germination, dormancy, fruit ripening and leaf fall, with growth promoters distinguished from inhibitors.
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