Growth promoting substance in plant is:
Correct answer: C. I.A.A
- A. F.A.D
- B. Chlorophyll a
- C. I.A.A
- D. ABA
Explanation
The correct answer is I.A.A (Indole-3-acetic acid), which is an auxin, a class of plant hormones that are essential for cell elongation, root development, and various other growth processes. Auxins like I.A.A are key in regulating plant growth and encouraging developmental changes.F.A.D is unrelated to growth promotion because it functions primarily in energy transfer and redox reactions. Chlorophyll a is essential for photosynthesis, converting light energy into chemical energy, but it is not a hormone involved in growth promotion. ABA, while important for stress response and dormancy, acts more as a growth inhibitor rather than a promoter.
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