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Q. No.Consider the given two statements:
Assertion (A):
Unlike animals, plants retain the capacity for unlimited growth throughout their life.
Reason (R):
Unlike animals, there is presence of meristems at certain locations in their body.
1.
Both (A) and (R) are True and (R) correctly explains (A).
2.
(A) is True; (R) is False
3.
(A) is False; (R) is False
4.
Both (A) and (R) are True but (R) does not correctly explain (A).
Subtopic: Growth Model |
86%
From NCERT
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The names of Skoog and Miller are associated with the discovery of:
| 1. | Cytokinins | 2. | Ethylene |
| 3. | Jasmonates | 4. | GAs |
Subtopic: Cytokinin |
86%
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Auxins:
I: promote flowering in tomatoes.
II: induce parthenocarpy in pineapples.
I: promote flowering in tomatoes.
II: induce parthenocarpy in pineapples.
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
Subtopic: Growth Hormones & Auxin |
64%
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Formation of interfascicular cambium and cork cambium in certain plants is an example of:
| 1. | Differentiation | 2. | De-differentiation |
| 3. | Re-differentiation | 4. | Anti-differentiation |
Subtopic: Differentiation, Dedifferentiation and Redifferentiation |
81%
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The documented effects of ethylene on plants include all the following, except:
| 1. | It breaks seed and bud dormancy |
| 2. | It initiates germination in peanut seeds |
| 3. | It does not allow sprouting of potato tubers |
| 4. | It promotes root growth and root hair formation. |
Subtopic: Ethylene |
80%
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Identify the incorrectly matched row:
| PGR | Chemical nature | Discovered by | |
| 1. | Auxin | Indole | F. W. Went |
| 2. | Gibberellin | Sphingosines | Yoshinori Ohsumi |
| 3. | Cytokinin | Adenine derivatives | Skoog and Miller |
| 4. | Ethylene | Gaseous | Cousins |
Subtopic: Gibberellin |
91%
From NCERT
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During micropropagation, which PGR is used to initiate rooting in stem cuttings?
| 1. | Gibberellin | 2. | Ethylene |
| 3. | Cytokinin | 4. | Auxin |
Subtopic: Auxin Function |
83%
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The given picture shows ‘bolting’ in a plant with rosette habit. What PGR may be responsible for this?
1. ABA
2. GA3
3. IAA
4. Ethylene
1. ABA
2. GA3
3. IAA
4. Ethylene
Subtopic: Gibberellin |
90%
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Identify the correct statements:
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
| I: | Auxins, gibberellins and cytokinins are plant growth promoters. |
| II: | ABA is an inhibitor of plant growth activities. |
| III: | Ethylene is largely a plant growth promoter. |
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: Growth Hormones & Auxin | Gibberellin | Cytokinin | Ethylene | Abscisic Acid |
72%
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How many statements regarding Ethylene are true?
1. 0
2. 1
3. 2
4. 3
| I: | It is synthesised in large amounts by tissues undergoing senescence and ripening fruits. |
| II: | It promotes senescence and abscission of plant organs especially of leaves and flowers. |
| III: | It enhances the respiration rate during ripening of the fruits. |
2. 1
3. 2
4. 3
Subtopic: Ethylene |
78%
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