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.
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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