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Q. No.The ascent of xylem sap in plants is mainly accomplished by the:
1.
size of the stomatal aperture
2.
distribution of stomata on the upper and lower epidermis
3.
cohesion and adhesion between water molecules
4.
root pressure
Subtopic: Transpiration Pull: Illustration |
71%
From NCERT
NEET - 2022
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Consider the mode of transport shown in the given figure.
I: The mode of transport shown is facilitated diffusion.
II: Membrane proteins set up a concentration gradient for the substances to be transported across the membrane by this mode of transport.
1. I is correct and II is also correct
2. I is correct but II is incorrect
3. I is incorrect and II is incorrect
4. I is incorrect and II is correct
I: The mode of transport shown is facilitated diffusion.
II: Membrane proteins set up a concentration gradient for the substances to be transported across the membrane by this mode of transport.
1. I is correct and II is also correct
2. I is correct but II is incorrect
3. I is incorrect and II is incorrect
4. I is incorrect and II is correct
Subtopic: Means of Transport: Active |
52%
From NCERT
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The given table shows a comparison of different transport mechanisms. Identify I, II and III:
Options:
| I | II | III | |
| Requires special membrane proteins | No | Yes | Yes |
| Highly selective | No | Yes | Yes |
| Transport saturates | No | Yes | Yes |
| Uphill transport | No | No | Yes |
| Requires ATP energy | No | No | Yes |
| I | II | III | |
| 1. | Simple diffusion | Facilitated diffusion | Active transport |
| 2. | Facilitated diffusion | Simple diffusion | Active transport |
| 3. | Simple diffusion | Active transport | Facilitated diffusion |
| 4. | Facilitated diffusion | Active transport | Simple diffusion |
Subtopic: Means of Transport: Active | Means of Transport: Passive |
89%
From NCERT
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The diagram shows an experiment where a solution of sucrose in water taken in a funnel is separated from pure water in a beaker by a selectively permeable membrane. External pressure can be applied from the upper part of the funnel such that no water diffuses into the funnel through the membrane.
I: This pressure required to prevent water from diffusing is in fact, the osmotic pressure and this is the function of the solute concentration; more the solute concentration, greater will be the pressure required to prevent water from diffusing in.
II: Numerically, osmotic pressure is equivalent to the osmotic potential, but the sign is opposite. Osmotic pressure is the positive pressure applied, while osmotic potential is negative.
1. I is correct and II is also correct
2. I is correct but II is incorrect
3. I is incorrect and II is incorrect
4. I is incorrect and II is correct
I: This pressure required to prevent water from diffusing is in fact, the osmotic pressure and this is the function of the solute concentration; more the solute concentration, greater will be the pressure required to prevent water from diffusing in.
II: Numerically, osmotic pressure is equivalent to the osmotic potential, but the sign is opposite. Osmotic pressure is the positive pressure applied, while osmotic potential is negative.
1. I is correct and II is also correct
2. I is correct but II is incorrect
3. I is incorrect and II is incorrect
4. I is incorrect and II is correct
Subtopic: Water Potential Concept |
83%
From NCERT
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The diagram shows the pathway of water movement in the root. Which of the following statements will be true?
I: The movement is relatively slower via the apoplast but the movement is down a potential gradient.
II: The symplast does not provide any barrier to water movement and water movement is through mass flow.
1. I is correct and II is also correct
2. I is correct but II is incorrect
3. I is incorrect and II is incorrect
4. I is incorrect and II is correct
I: The movement is relatively slower via the apoplast but the movement is down a potential gradient.
II: The symplast does not provide any barrier to water movement and water movement is through mass flow.
1. I is correct and II is also correct
2. I is correct but II is incorrect
3. I is incorrect and II is incorrect
4. I is incorrect and II is correct
Subtopic: Water Absorption |
64%
From NCERT
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Look at the walls of the guard cells and the orientation of cellulosic microfibrils in them and select the correct statements:
Statement I: The inner wall of each guard cell, towards the pore or stomatal aperture, is thick and elastic.
Statement II: Cellulose microfibrils are oriented longitudinally rather than radially making it easier for the stoma to open.
1. Statement I is correct and statement II is also correct
2. Statement I is correct but statement II is incorrect
3. Statement I is incorrect and Statement II is incorrect
4. Statement I is incorrect and statement II is correct
Statement I: The inner wall of each guard cell, towards the pore or stomatal aperture, is thick and elastic.
Statement II: Cellulose microfibrils are oriented longitudinally rather than radially making it easier for the stoma to open.
1. Statement I is correct and statement II is also correct
2. Statement I is correct but statement II is incorrect
3. Statement I is incorrect and Statement II is incorrect
4. Statement I is incorrect and statement II is correct
Subtopic: Transpiration & Guttation |
78%
From NCERT
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The diagram shows a schematic presentation of the Münch flow hypothesis. Identify the correct statements:
I. Sugars are loaded into the sieve tubes of the phloem at the sugar source (leaf). The osmotic pressure of the sieve tubes is decreased; water is taken up from the surrounding tissue, which results in an increase in turgor pressure at the source.
II. Unloading of sugars from the sieve tubes at the sinks (stem and roots) increases the sieve tube osmotic pressure, water escapes to surrounding tissue, and turgor pressure is reduced.
III. The turgor pressure gradient between the source and the sink is the driving force for phloem transport.
IV. Phloem function is linked to xylem transport as water circulates between the two tissues. Phloem takes up water from the xylem along the whole transport pathway unless sugar unloading is locally very large. The transpiration stream in the leaves can also pass apoplastically along the cell walls without crossing the membrane of cells.
1. I, II and III only
2. I, II and IV only
3. I, III and IV only
4. I, II, III and IV
I. Sugars are loaded into the sieve tubes of the phloem at the sugar source (leaf). The osmotic pressure of the sieve tubes is decreased; water is taken up from the surrounding tissue, which results in an increase in turgor pressure at the source.
II. Unloading of sugars from the sieve tubes at the sinks (stem and roots) increases the sieve tube osmotic pressure, water escapes to surrounding tissue, and turgor pressure is reduced.
III. The turgor pressure gradient between the source and the sink is the driving force for phloem transport.
IV. Phloem function is linked to xylem transport as water circulates between the two tissues. Phloem takes up water from the xylem along the whole transport pathway unless sugar unloading is locally very large. The transpiration stream in the leaves can also pass apoplastically along the cell walls without crossing the membrane of cells.
1. I, II and III only
2. I, II and IV only
3. I, III and IV only
4. I, II, III and IV
Subtopic: Ascent of Sap | Phloem Translocation | Long Distance Transport of Water |
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The chief sink for the mineral elements in plants are all, except
1. Young leaves
2. Storage organs
3. Lateral meristems
4. Senescing parts
1. Young leaves
2. Storage organs
3. Lateral meristems
4. Senescing parts
Subtopic: Phloem Translocation |
71%
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"Girdling Experiment" was performed by Plant Physiologists to identify the plant tissue through which:
| 1. | osmosis is observed |
| 2. | water is transported |
| 3. | food is transported |
| 4. | for both water and food transportation |
Subtopic: Phloem Translocation: Short Distance Transport | Phloem Translocation |
78%
From NCERT
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Consider the characteristics of various means of transport in plants:
I. Requires special membrane proteins
II. Highly selective
III. Downhill transport
IV. Does not require ATP energy
1. While I and II are true for both facilitated diffusion and active transport, III and IV are true for both facilitated diffusion and simple diffusion.
2. While I and II are true for both facilitated diffusion and simple diffusion, III and IV are true for both facilitated diffusion and active transport.
3. Only III will be true for simple diffusion.
4. I, II, III and IV are all true for active transport.
I. Requires special membrane proteins
II. Highly selective
III. Downhill transport
IV. Does not require ATP energy
1. While I and II are true for both facilitated diffusion and active transport, III and IV are true for both facilitated diffusion and simple diffusion.
2. While I and II are true for both facilitated diffusion and simple diffusion, III and IV are true for both facilitated diffusion and active transport.
3. Only III will be true for simple diffusion.
4. I, II, III and IV are all true for active transport.
Subtopic: Means of Transport: Active | Means of Transport: Passive | Facilitated Diffusion |
76%
From NCERT
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