Question:
Identify the correct combinations:
Physiological Effect Positive Role Negative Role I. Senescence Abscisic Acid Gibberellins II. Seed Germination Ethylene Abscisic Acid III. Seed Dormancy Abscisic Acid Ethylene IV. Apical Dominance Auxin Cytokinin
Identify the correct combinations:
| Physiological Effect | Positive Role | Negative Role |
|---|---|---|
| I. Senescence | Abscisic Acid | Gibberellins |
| II. Seed Germination | Ethylene | Abscisic Acid |
| III. Seed Dormancy | Abscisic Acid | Ethylene |
| IV. Apical Dominance | Auxin | Cytokinin |
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ABA promotes dormancy and senescence, whereas cytokinins and gibberellins generally oppose aging and promote growth.
Updated On: Jun 13, 2026
- I & II only
- III & IV only
- I, II & III only
- I, II, III & IV
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Concept:
Plant growth regulators may either promote or inhibit physiological processes.
Their effects depend upon concentration, tissue type and developmental stage.
Step 1: Analyze Senescence. Abscisic acid promotes senescence and aging. Gibberellins delay senescence. Therefore Statement I is correct.
Step 2: Analyze Seed Germination. Ethylene promotes seed germination. Abscisic acid inhibits germination and promotes dormancy. Therefore Statement II is correct.
Step 3: Analyze Seed Dormancy. ABA induces dormancy. Ethylene helps break dormancy. Therefore Statement III is correct.
Step 4: Analyze Apical Dominance. Auxin maintains apical dominance. Cytokinins counteract apical dominance by stimulating lateral bud growth. Therefore Statement IV is correct.
Step 5: Final conclusion. All four combinations are correct. Hence option (D) is correct.
Step 1: Analyze Senescence. Abscisic acid promotes senescence and aging. Gibberellins delay senescence. Therefore Statement I is correct.
Step 2: Analyze Seed Germination. Ethylene promotes seed germination. Abscisic acid inhibits germination and promotes dormancy. Therefore Statement II is correct.
Step 3: Analyze Seed Dormancy. ABA induces dormancy. Ethylene helps break dormancy. Therefore Statement III is correct.
Step 4: Analyze Apical Dominance. Auxin maintains apical dominance. Cytokinins counteract apical dominance by stimulating lateral bud growth. Therefore Statement IV is correct.
Step 5: Final conclusion. All four combinations are correct. Hence option (D) is correct.
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