Q. No.NCERT textbook says that plant growth is unique. What is the character of plant growth being referred to?
1. Plants have a closed growth
2. Capacity of unlimited growth throughout life
3. Complete absence of growth after a certain age
4. Growth without development
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All the following contribute to an increase in girth of dicots and gymnosperms except:
| 1. Apical meristem | 2. Lateral meristems |
| 3. Vascular cambium | 4. Cork-cambium |
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Statement I: The root apical meristem and the shoot apical meristem are responsible for the primary growth of the plants and principally contribute to the elongation of the plants along their axis.
Statement II: In dicots and gymnosperms, the lateral meristems, vascular cambium and cork-cambium appear later in life and cause the increase in the girth of the organs in which they are active.
1. Both Statement I and Statement II
2. Only Statement I
3. Only Statement II
4. Neither Statement I nor Statement II
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Match Column I [phase of growth] and Column II [cell characteristics] and choose the correct answer from the codes given:
| COLUMN I | COLUMN II | ||
| A | Meristematic | a | Increased vacuolation, new cell wall deposition |
| B | Elongation | b | Thin cellulosic wall with abundant plasmodesmatal connections |
| C | Maturation | c | Maximal wall thickening |
Codes
| A | B | C | |
| 1. | a | b | c |
| 2. | b | c | a |
| 3. | b | a | c |
| 4. | c | b | a |
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Identify the incorrect statement regarding the arithmetic growth?
1. Following mitosis, both daughter cells continue to divide
2. Can be exemplified by root elongating at a constant rate
3. On plotting the length of the organ against time, a linear curve is obtained
4. Mathematically it is expressed as
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The shape of the growth curve characteristic of a living organism growing in natural environment is:
| 1. Linear | 2. Sigmoid |
| 3. Hyperbola | 4. Bell shaped |
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Plant growth and further development is intimately linked to water status of the plant because:
A. Turgidity of cells helps in extension growth
B. It provides medium for enzymatic activity
1. Both A and B are correct
2. Only A is correct
3. Only B is correct
4. Both A and B are incorrect
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The optimum temperature range for proper growth in most plants is:
| 1. \(0^\circ C - 100^\circ C\) | 2. \(15^\circ C - 20^\circ C\) |
| 3. \(28^\circ C - 30^\circ C\) | 4. Greater than \(45^\circ C\) |
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Consider the given diagram and select the correct inference:
1. Both leaves have shown different absolute growths
2. First leaf has exhibited growth but second leaf has not as it is already senescent
3. The relative growth of first leaf is more than that of the second leaf
4. Both leaves have exhibited equal relative growths
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I: The region shown as A to G is the zone of elongation.
II. The portion of the axis which is undergoing the phase of maturation lies more distal to the phase of elongation.
| 1. Only I | 2. Only II |
| 3. Both I and II | 4. Neither I nor II |
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