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Q. No.Which of the following, principally, contribute to the elongation of the plants along their axis?
I:
Root apical meristem
II:
Shoot apical meristem
III:
Vascular cambium
IV:
Cork-cambium
1. Only I and II
2. Only III and IV
3. Only I and III
4. Only II and IV
Subtopic: Growth |
88%
From NCERT
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Consider the given two statements:
| Assertion (A): | Growth, at the cellular level, is measured by a variety of parameters, some of which are: increase in fresh weight, dry weight, length, area, volume and cell number. |
| Reason (R): | Growth, at a cellular level, is principally a consequence of an increase in the amount of protoplasm, and increase in protoplasm is difficult to measure directly. |
| 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 |
74%
From NCERT
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The cells in the region of elongation at the root apex are not characterised by:
| 1. | Increased vacuolation | 2. | Cell enlargement |
| 3. | Constant division | 4. | New cell wall deposition |
Subtopic: Growth |
72%
From NCERT
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Mathematically, arithmetic growth in plants is expressed as:
| 1. | Lt = L0 + rt | 2. | Lt = L0 X rt |
| 3. | Lt = L0 / rt | 4. | Lt = L0 - rt |
Subtopic: Growth Model |
95%
From NCERT
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Consider the given two statements:
| Assertion (A): | A sigmoid curve is a characteristic of living organism growing in a natural environment. |
| Reason (R): | It is typical for all cells, tissues and organs of a plant. |
| 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 |
From NCERT
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The efficiency index in the geometric growth equation W1 = W0 ert is denoted by:
1. W0
2.W1
3. r
4. e
1. W0
2.W1
3. r
4. e
Subtopic: Growth Model |
82%
From NCERT
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Consider the given two statements:
| Assertion (A): | Plant growth is intimately linked to the water status of the plant while development is not. |
| Reason (R): | The plant cells grow in size by cell enlargement which in turn requires water. |
| 1. | Both (A) and (R) are True and (R) correctly explains the (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain the (A). |
| 3. | (A) is True; (R) is False. |
| 4. | (A) is False; (R) is True. |
Subtopic: Growth |
50%
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 |
Subtopic: Differentiation, Dedifferentiation and Redifferentiation |
66%
From NCERT
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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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Which plant growth regulators are terpenes?
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: Growth Hormones & Auxin |
87%
From NCERT
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