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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 |
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Identify the incorrect statement:
| 1. | Growth is primarily expressed as increase in number of cells at the root apical meristem in maize. |
| 2. | Growth is primarily represented as increase in size of cells in watermelons. |
| 3. | Growth of a pollen tube is measured in terms of its girth. |
| 4. | An increase in surface area denotes the growth in a dorsiventral leaf. |
Subtopic: Growth | Growth Terminology |
90%
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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 |
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What would not be true for the cells in the meristematic region at the root apex?
| 1. | They are constantly dividing cells. |
| 2. | They are rich in protoplasm, possess large conspicuous nuclei. |
| 3. | Their cell walls are primary in nature. |
| 4. | Plasmodesmatal connections between the cells are absent. |
Subtopic: Growth | Growth Model | Development |
88%
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 |
73%
From NCERT
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The cells of which zone at the root apex attain their maximal size in terms of wall thickening and protoplasmic modifications?
1. Root cap
2. Meristematic zone
3. Elongation zone
4. Maturation zone
1. Root cap
2. Meristematic zone
3. Elongation zone
4. Maturation zone
Subtopic: Growth | Growth Terminology | Development | Differentiation, Dedifferentiation and Redifferentiation |
76%
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 geometric growth, following mitotic cell division, only one daughter cell continues to divide while the other differentiates and matures. |
| Statement II: | In arithmetic growth, both the progeny cells following mitotic cell division retain the ability to divide and continue to do so. |
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
Subtopic: Growth | Growth Model |
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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%
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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 |
83%
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