Auxins and gibberellins are plant hormones. The common role of these hormones is to
Correct answer: C. Promote bud initiation and delay leaf senescence
- A. Delay both bud initiation and leaf senescence
- B. Promote both bud initiation and leaf senescence
- C. Promote bud initiation and delay leaf senescence
- D. Promote leaf senescence and delay bud initiation
Explanation
The correct answer is that auxins and gibberellins promote bud initiation and delay leaf senescence. These plant hormones are involved in various growth processes, including the stimulation of bud growth. They help maintain the plant's vitality by delaying the aging of leaves, which is a process known as leaf senescence. The incorrect options either misstate the effects of these hormones on buds and leaves or reverse their roles entirely.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
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.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Plant Growth Regulators questions
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
The hormone(s) synthesised in the meristematic tissue of the plant shoot and root is/ areI. Abscisic acidII. AuxinIII. Cytokinin
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
The option that identifies the plant's response provoked by red and blue light is
The given diagram shows the histology of a developing shoot of a plant.The labelled structure gives rise to