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Q. No.In plants, during growth and development:
I:
Turgidity of cells helps in extension growth.
II:
Water provides the medium for enzymatic activities needed for growth.
III:
Oxygen helps in releasing metabolic energy essential for growth activities.
IV:
Nutrients (macro and micro essential elements) are required for the synthesis of protoplasm and act as source of energy.
1. Only I, II and III are correct
2. Only I, III and IV are correct
3. Only II, III and IV are correct
4. I, II, III and IV are correct
Subtopic: Growth | Growth Terminology | Differentiation, Dedifferentiation and Redifferentiation |
90%
From NCERT
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When a cell in plants differentiates to form a tracheary element:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | it would gain a lot of protoplasm. |
| II: | it develops a very strong, elastic, lignocellulosic secondary cell walls. |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Growth Model | Differentiation, Dedifferentiation and Redifferentiation |
74%
From NCERT
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Which of the following is not formed as result of re-differentiation in plants?
1. Cork cambium
2. Phellem
3. Periderm
4. Secondary xylem
1. Cork cambium
2. Phellem
3. Periderm
4. Secondary xylem
Subtopic: Differentiation, Dedifferentiation and Redifferentiation |
66%
From NCERT
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The examples of de-differentiation in plants include:
| I: | Formation of a tumour. |
| II: | Parenchyma cells made to divide under controlled laboratory conditions during plant tissue culture. |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
Subtopic: Growth Terminology | Development | Differentiation, Dedifferentiation and Redifferentiation |
64%
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Consider the given two statements:
1. Statement I is correct; Statement II is incorrect
2. Statement I is correct; Statement II is correct
3. Statement I is incorrect; Statement II is incorrect
4. Statement I is incorrect; Statement II is correct
| Statement I: | In cotton, coriander, and larkspur, differences in the shapes of leaves produced in air and those produced in water represent heterophyllous development due to environment. |
| Statement II: | In buttercup, the leaves of the juvenile plant are different in shape from those in mature plants. |
2. Statement I is correct; Statement II is correct
3. Statement I is incorrect; Statement II is incorrect
4. Statement I is incorrect; Statement II is correct
Subtopic: Development |
57%
From NCERT
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Auxin was isolated from tips of coleoptiles of oat seedlings by:
1. Charles Darwin
2. F. W. Went
3. Boysen and Jensen
4. Francis Darwin
1. Charles Darwin
2. F. W. Went
3. Boysen and Jensen
4. Francis Darwin
Subtopic: Growth Hormones & Auxin |
94%
From NCERT
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The ‘bakanae’ (foolish seedling) disease of rice seedlings is associated with the discovery of:
1. Auxins
2. Gibberellins
3. Ethylene
4. Abscisic acid
1. Auxins
2. Gibberellins
3. Ethylene
4. Abscisic acid
Subtopic: Gibberellin |
95%
From NCERT
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F. Skoog and his co-workers observed that from the internodal segments of tobacco stems the callus proliferated only if extracts of vascular tissues or yeast extract or coconut milk or DNA supplements the medium already containing:
1. Auxins
2. Gibberellins
3. Ethylene
4. Kinetins
1. Auxins
2. Gibberellins
3. Ethylene
4. Kinetins
Subtopic: Growth Hormones & Auxin |
From NCERT
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During mid-1960s, three independent researches reported the purification and chemical characterisation of three different kinds of inhibitors: inhibitor-B, abscission II and dormin. Later all the three were proved to be chemically identical. It was named:
1. Indole-3-acetic acid
2. N6-furfurylamino purine
3. Abscisic acid
4. Gibberellic acid
1. Indole-3-acetic acid
2. N6-furfurylamino purine
3. Abscisic acid
4. Gibberellic acid
Subtopic: Abscisic Acid |
93%
From NCERT
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Consider the two statements:
| Assertion(A): | Apical dominance is most likely adaptive. |
| Reason(R): | It is important for the plant to devote energy to growing upward so that it can get more light to undergo photosynthesis. |
| 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; (R) is False. |
| 4. | (A) is False; (R) is True. |
Subtopic: Growth Hormones & Auxin |
74%
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