- 1(current)
Q. No.The phenomenon where roots grow toward water is termed:
1. Hydrotropism which is a positive growth response to moisture gradient
2. Geotropism which is a positive growth response to gravitational pull
3. Chemotropism which is a growth response to chemical stimuli
4. Thigmotropism which is a growth response to touch stimuli
1. Hydrotropism which is a positive growth response to moisture gradient
2. Geotropism which is a positive growth response to gravitational pull
3. Chemotropism which is a growth response to chemical stimuli
4. Thigmotropism which is a growth response to touch stimuli
Subtopic: Growth |
77%
Level 2: 60%+
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Plant growth is termed indeterminate primarily because plants:
1. Exhibit geometric growth throughout life
2. Possess meristems capable of continuous cell division
3. Undergo secondary growth only
4. Lack genetically programmed senescence
1. Exhibit geometric growth throughout life
2. Possess meristems capable of continuous cell division
3. Undergo secondary growth only
4. Lack genetically programmed senescence
Subtopic: Growth |
87%
Level 1: 80%+
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The open form of growth in plants implies that:
1. All cells retain the capacity to divide
2. Growth occurs only at apical regions
3. New cells are continuously added by meristems
4. Cell differentiation is irreversible
1. All cells retain the capacity to divide
2. Growth occurs only at apical regions
3. New cells are continuously added by meristems
4. Cell differentiation is irreversible
Subtopic: Growth |
88%
Level 1: 80%+
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Which parameter best reflects growth in a pollen tube?
1. Surface area
2. Volume
3. Length
4. Dry weight
1. Surface area
2. Volume
3. Length
4. Dry weight
Subtopic: Growth |
94%
Level 1: 80%+
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In roots, the phase of elongation is characterised by:
1. Thin primary cell walls with dense protoplasm
2. Increased vacuolation and cell enlargement
3. Lignified secondary walls
4. Loss of protoplasm
1. Thin primary cell walls with dense protoplasm
2. Increased vacuolation and cell enlargement
3. Lignified secondary walls
4. Loss of protoplasm
Subtopic: Growth |
92%
Level 1: 80%+
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Arithmetic growth differs from geometric growth in that in arithmetic growth:
1. Both daughter cells divide
2. Only one daughter cell continues to divide
3. Growth rate accelerates exponentially
4. Sigmoid curve is obtained
1. Both daughter cells divide
2. Only one daughter cell continues to divide
3. Growth rate accelerates exponentially
4. Sigmoid curve is obtained
Subtopic: Growth |
89%
Level 1: 80%+
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The sigmoid growth curve is characteristic of:
1. Artificial culture systems only
2. Natural growth of living organisms
3. Meristematic tissues exclusively
4. Secondary growth
1. Artificial culture systems only
2. Natural growth of living organisms
3. Meristematic tissues exclusively
4. Secondary growth
Subtopic: Growth |
86%
Level 1: 80%+
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Relative growth rate is a better measure than absolute growth rate because it:
1. Eliminates environmental effects
2. Considers growth per unit initial size
3. Measures only length increase
4. Is independent of time
1. Eliminates environmental effects
2. Considers growth per unit initial size
3. Measures only length increase
4. Is independent of time
Subtopic: Growth |
93%
Level 1: 80%+
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Development in plants is considered flexible because:
1. Growth and differentiation are genetically fixed
2. Differentiation is determinate
3. Cells arising from same meristem may mature differently
4. Environmental factors play no role
1. Growth and differentiation are genetically fixed
2. Differentiation is determinate
3. Cells arising from same meristem may mature differently
4. Environmental factors play no role
Subtopic: Growth |
79%
Level 2: 60%+
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Consider the following statements regarding plant growth:
Which of the above statements are correct?
1. I only
2. I and II only
3. I and III only
4. I, II and III
| I. | Growth in plants involves a permanent and irreversible increase in size. |
| II. | All cells produced by meristems continue to divide throughout the life of the plant. |
| III. | Plant growth is called open growth because new cells are continuously added by meristems. |
1. I only
2. I and II only
3. I and III only
4. I, II and III
Subtopic: Growth |
Level 3: 35%-60%
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Q. No.
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