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
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 |
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 |
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 |
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 |
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 |
| 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 |
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 \(45^\circ C\) |
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 |
| 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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