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Which of the following is largely a plant growth inhibitor but is also involved in some growth promotion activities?
(A) . Auxins
(B) . Gibberellins
(C) . Cytokinin
(D) . Abscisic acid
(©). Ethylene
Choose the correct answer from the options given below:
EXPLANATION
Plant Growth Regulators, Sex Expression, Part
- Dual Physiological Roles of Ethylene (E):
- Ethylene is historically classified as a growth inhibitor / senescence hormone because it promotes fruit ripening, chlorophyll degradation, leaf epinasty, and organ abscission.
- However, it also plays indispensable growth-promoting and developmental roles, including:
- Breaking seed dormancy in cereals and peanuts.
- Stimulating root hair emergence and adventitious root initiation.
- Promoting female flower (pistillate) expression in cucurbitaceous vegetables (inducing high gynoecy in cucumber and squash).
- Correct Option: Option 4 ((E) only).
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