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.
Last updated
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.
Practise Forms and Functions of Plants
272 free Forms and Functions of Plants MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Biology questions like this
Biology is on 6 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
The hormone(s) synthesised in the meristematic tissue of the plant shoot and root is/ areI. Abscisic acidII. AuxinIII. Cytokinin
The given diagram shows a stem tendril helping a plant to climb up a support.The type of growth movement exhibited by the plant is
Auxins and gibberellins are plant hormones. The common role of these hormones is to
The given diagrams, I and II, show the growth of a plant without and with hormone treatment. Based on the shown effect in diagram II, the hormones used in the mixture must be
Consider the given diagram. The phenomenon which induces the growth of plant I is