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Q. No.Choose the characteristics associated with root pressure.
a.
Pressure hydrostatic pressure.
b.
Develops due to concentration of sugars in roots.
c.
Accounts for bulk movement rate of up to 15 metres per hour.
d.
Evaporation decreases root pressure.
1. Only d
2. a,c and d only
3. a and d only
4. b and d only
Subtopic: Transpiration & Guttation |
From NCERT
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A botanist placed wet cobalt chloride strip on upper and lower surface of leaf of 2 different plants, say A and B. Wet cobalt chloride turn its colour from pink to blue when it is dried. Time taken to turn the colour of cobalt chloride is mentioned below.
Find the correct conclusion
1. Plant A have more stomata on upper surface.
2. Plant B have less stomata on lower surface.
3. Plant A have less stomata on upper surface.
4. Plant B can't have equal number of stomata on both surfaces
| Upper surface | Lower surface | |
| Plant A | 12 mins | 2 mins |
| Plant B | 2 mins | 2.3 mins |
Find the correct conclusion
1. Plant A have more stomata on upper surface.
2. Plant B have less stomata on lower surface.
3. Plant A have less stomata on upper surface.
4. Plant B can't have equal number of stomata on both surfaces
Subtopic: Transpiration & Guttation |
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Time required and water loss to fix 1 g of CO2 by plant A and B of same weight is given below.
Choose the correct option
1. Both are C3 plants
2. Both are C4 plants
3. Plant A is C4 while plant B is C3
4. Plant B is C4 while platn is C3
| Time required | Water loss | |
| A | 5 hours | 1.5 litre |
| B | 10 hours | 3 litre |
Choose the correct option
1. Both are C3 plants
2. Both are C4 plants
3. Plant A is C4 while plant B is C3
4. Plant B is C4 while platn is C3
Subtopic: Photosynthesis Transpiration Compromise & Mineral Translocation |
58%
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Water vapour diffuses out from sub stomatal cavity into atmosphere because
1. Positive pressure is created
2. Water has high tensile strength
3. Atmosphere has maximum saturation of water
4. Sub-stomatal cavity has higher \(\psi_{w}\)
1. Positive pressure is created
2. Water has high tensile strength
3. Atmosphere has maximum saturation of water
4. Sub-stomatal cavity has higher \(\psi_{w}\)
Subtopic: Transpiration & Guttation |
59%
From NCERT
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Plant obtain their carbon and most of their oxygen from
1. CO2 in the atmosphere
2. Water and minerals in the soil
3. Reduced carbons absorbed through epidermis
4. Oxygenated minerals in the epidermis
1. CO2 in the atmosphere
2. Water and minerals in the soil
3. Reduced carbons absorbed through epidermis
4. Oxygenated minerals in the epidermis
Subtopic: Uptake and Transport of Mineral Nutrients |
66%
From NCERT
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Tracheary elements help in capillarity because they
1. have non-polar surface
2. can store a large amount of water
3. have smaller diameter
4. can create negative hydrostatic pressure
1. have non-polar surface
2. can store a large amount of water
3. have smaller diameter
4. can create negative hydrostatic pressure
Subtopic: Transpiration & Guttation |
55%
From NCERT
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Find the incorrect statement regarding root endodermis
1. blocks apoplast movement of water
2. have suberin deposition
3. single layered
4. transport ions in both directions
1. blocks apoplast movement of water
2. have suberin deposition
3. single layered
4. transport ions in both directions
Subtopic: Photosynthesis Transpiration Compromise & Mineral Translocation |
64%
From NCERT
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Inner walls of guard cell forms crescent shape when
1. It loses water
2. Stoma is closed
3. It is turgid
4. Microfibrils are oriented longitudinally
1. It loses water
2. Stoma is closed
3. It is turgid
4. Microfibrils are oriented longitudinally
Subtopic: Stomata |
50%
From NCERT
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Chloroplasts can move within cytoplasm with the help of
1. Apoplastic movement
2. Cytoplasmic streaming
3. Plasmodesmata
4. Turgor pressure
1. Apoplastic movement
2. Cytoplasmic streaming
3. Plasmodesmata
4. Turgor pressure
Subtopic: Water Absorption |
74%
From NCERT
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Unloading of sucrose from phloem to sink
1. Decreases osmotic pressure in phloem
2. Make phloem hypertonic
3. Increases the osmotic pressure in phloem
4. Lead to influx of water into phloem
1. Decreases osmotic pressure in phloem
2. Make phloem hypertonic
3. Increases the osmotic pressure in phloem
4. Lead to influx of water into phloem
Subtopic: The Pressure Flow or Mass Flow Hypothesis |
61%
From NCERT
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