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Q. No.Which plant growth regulator is critical in breaking seed and bud dormancy in flowering plants?
1. GA
2. Cytokinin
3. Ethylene
4. ABA
1. GA
2. Cytokinin
3. Ethylene
4. ABA
Subtopic: Â Ethylene |
From NCERT
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Which plant growth regulators, respectively, prevent and promote leaf abscission in plants?
1. Auxin and Ethylene
2. Auxin and Abscisic Acid
3. Gibberellin and Cytokinin
4. Abscisic Acid and Ethylene
1. Auxin and Ethylene
2. Auxin and Abscisic Acid
3. Gibberellin and Cytokinin
4. Abscisic Acid and Ethylene
Subtopic: Â Growth Hormones & Auxin |Â Ethylene |
From NCERT
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Influences of ethylene on dicot plants include:
1. Only I and II
2. Only III
3. Only II and III
4. I, II and III
| I: | vertical growth of seedlings |
| II: | thinning of the axis |
| III: | apical hook formation |
2. Only III
3. Only II and III
4. I, II and III
Subtopic: Â Ethylene |
 52%
From NCERT
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Ethylene exhibits its characteristic triple response in seedlings, which includes:
| 1. | Inhibition of stem elongation, thickening of the stem, and horizontal growth. |
| 2. | Increased leaf expansion, root elongation, and faster seed germination. |
| 3. | Acceleration of flowering, increased transpiration, and decreased chlorophyll content. |
| 4. | Suppression of fruit ripening, promotion of seed dormancy, and increased stomatal closure. |
Subtopic: Â Ethylene |
From NCERT
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Consider the given two statements:
| Assertion (A): | Ethylene promotes fruit ripening. |
| Reason (R): | Ethylene is a gaseous hormone that influences various aspects of plant development. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 3. | (A) is True but (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Â Ethylene |
 57%
From NCERT
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