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Q. No.A higher ratio of cytokinin in medium of tissue culture in plants:
1. induces growth of shoot buds
2. induces root formation
3. leads to death of cells in callus
4. leads to a decrease in cell division
Subtopic: Cytokinin |
88%
From NCERT
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Which of the following will be true for cells in the meristematic zone at root apex?
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
| I: | They are rich in protoplasm, possess large conspicuous nuclei. |
| II: | Their cell walls are primary in nature, thin and cellulosic with abundant plasmodesmatal connections. |
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Growth |
91%
From NCERT
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Regarding conditions of growth in plants:
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I: | Water provides the medium for enzymatic activities needed for growth. |
| II: | Oxygen helps in releasing metabolic energy essential for growth activities. |
| III: | Nutrients (macro and micro essential elements) are required by plants for the synthesis of protoplasm and act as source of energy. |
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Growth |
93%
From NCERT
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The given figure shows an experimental set up associated with the discovery of:
1. Auxins
2. Gibberellins
3. Cytokinin
4. Ethylene
1. Auxins2. Gibberellins
3. Cytokinin
4. Ethylene
Subtopic: Growth Hormones & Auxin |
99%
From NCERT
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What shaped curve is a characteristic of living organism growing in a natural environment?
1. S shaped
2. J shaped
3. Rectangular hyperbola
4. A straight line
1. S shaped
2. J shaped
3. Rectangular hyperbola
4. A straight line
Subtopic: Growth |
86%
From NCERT
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Consider the given two statements:
| Statement I: | In cotton, coriander and larkspur, the leaves of the juvenile plant are different in shape from those in mature plants. |
| Statement II: | In buttercup, shapes of leaves produced in air and those produced in water are different. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Development |
95%
From NCERT
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How many of the given pairs are correctly matched?
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
| I: | Indole compounds : IAA |
| II: | Adenine derivatives : kinetin |
| III: | Derivatives of carotenoids : GA3 |
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: Growth Hormones & Auxin |
71%
From NCERT
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How many of the given statements are correct?
1. 1
2. 2
3. 3
4. 4
| I: | All Gibberellins are acidic. |
| II: | Gibberellins, cause a fruit like apple to elongate and improve its shape. |
| III: | Gibberellins delay senescence. |
| IV: | GA3 is used to speed up the malting process in brewing industry. |
1. 1
2. 2
3. 3
4. 4
Subtopic: Gibberellin |
79%
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Consider the given two statements:
| Assertion (A): | Spraying juvenile conifers with GAs leads to early seed production. |
| Reason (R): | Spraying juvenile conifers with GAs hastens the maturity period. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Gibberellin |
88%
From NCERT
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Identify the incorrect statement:
| 1. | Cytokinins were discovered as kinetin (a modified form of adenine, a purine) from the autoclaved herring sperm DNA. |
| 2. | Kinetin occurs naturally in plants. |
| 3. | Natural cytokinins are synthesised in regions where rapid cell division occurs. |
| 4. | Cytokinins help overcome the apical dominance. |
Subtopic: Cytokinin |
99%
From NCERT
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