All the following are growth hormones, except
Correct answer: A. phytohormones
- A. phytohormones
- B. Gibberllin
- C. auxins
- D. cytokinesis
Explanation
All plant hormones are collectively known as growth hormones. They include growth promoters, e.g., auxins, cytokinins, gibberellins, etc. as well as growth inhibitors such as abscisic acid, etc. All of the options except option 'A' are growth hormones; thus, option 'A' is the correct answer. This division is further explained by the following diagram:
This question appeared on the ETEA MDCAT 2011 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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