Q. No.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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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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To differentiate into a tracheary element, a cell would:
1. Gain protoplasm
2. Become multinucleate
3. Assimilate lot of collagen and elastin
4. Develop lignocellulosic secondary cell wall
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Formation of interfascicular cambium and cork cambium is possible most importantly because of:
| 1. Differentiation | 2. Dedifferentiation |
| 3. Redifferentiation | 4. Reverse differentiation |
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The growth in plants can be best expressed as [refer Section 15.2]:
| 1. Open | 2. Determinate |
| 3. Closed | 4. Redundant |
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