Abscisic acid promotes:
Correct answer: D. Leaf, flower, and fruit fall
- A. Triple response
- B. Sex expression
- C. Flower initiation
- D. Leaf, flower, and fruit fall
Explanation
Abscisic acid (ABA) is a plant hormone that plays a key role in inhibiting growth and promoting dormancy in plants. It is particularly known for its role in the abscission or shedding of leaves, flowers, and fruits, especially under stress conditions such as drought. This is why it is sometimes referred to as the 'stress hormone.' The other options relate to functions typically influenced by other hormones: the triple response is associated with ethylene, sex expression is influenced by gibberellins and ethylene, and flower initiation is promoted by gibberellins.
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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