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Q. No.
In the diagram, regarding the pathway of water movement in the root, A, B, C and D are:
A
B
C
D
1.
Cuticle
Cortex
Pericycle
Endodermis
2.
Epidermis
Cortex
Hypodermis
Endodermis
3.
Hypodermis
Cortex
Endodermis
Pericycle
4.
Epidermis
Cortex
Endodermis
Pericycle
Subtopic: Pathways of transport |
81%
Level 1: 80%+
Hints
Identify the correct statement:
1. Mutual attraction between water molecules called as adhesion, attraction of water molecules to polar surfaces called as cohesion and water molecules being attracted to each other in the liquid phase more than to water in the gas phase called as surface tension are the properties of water that give it a high capillarity which is an ability to resist a pulling force and high tensile strength which is the ability to rise in tubes.
2. Mutual attraction between water molecules called as cohesion, attraction of water molecules to polar surfaces called as adhesion and water molecules being attracted to each other in the liquid phase more than to water in the gas phase called as surface tension are the properties of water that give it a high tensile strength which is an ability to resist a pulling force and high capillarity which is the ability to rise in tubes.
3. Mutual attraction between water molecules called as adhesion, attraction of water molecules to polar surfaces called as cohesion and water molecules being attracted to each other in the liquid phase more than to water in the gas phase called as surface tension are the properties of water that give it a high tensile strength which is an ability to resist a pulling force and high capillarity which is the ability to rise in tubes.
4. Mutual attraction between water molecules called as cohesion, attraction of water molecules to polar surfaces called as adhesion and water molecules being attracted to each other in the liquid phase more than to water in the gas phase called as surface tension are the properties of water that give it a high capillarity which is an ability to resist a pulling force and high tensile strength which is the ability to rise in tubes.
1. Mutual attraction between water molecules called as adhesion, attraction of water molecules to polar surfaces called as cohesion and water molecules being attracted to each other in the liquid phase more than to water in the gas phase called as surface tension are the properties of water that give it a high capillarity which is an ability to resist a pulling force and high tensile strength which is the ability to rise in tubes.
2. Mutual attraction between water molecules called as cohesion, attraction of water molecules to polar surfaces called as adhesion and water molecules being attracted to each other in the liquid phase more than to water in the gas phase called as surface tension are the properties of water that give it a high tensile strength which is an ability to resist a pulling force and high capillarity which is the ability to rise in tubes.
3. Mutual attraction between water molecules called as adhesion, attraction of water molecules to polar surfaces called as cohesion and water molecules being attracted to each other in the liquid phase more than to water in the gas phase called as surface tension are the properties of water that give it a high tensile strength which is an ability to resist a pulling force and high capillarity which is the ability to rise in tubes.
4. Mutual attraction between water molecules called as cohesion, attraction of water molecules to polar surfaces called as adhesion and water molecules being attracted to each other in the liquid phase more than to water in the gas phase called as surface tension are the properties of water that give it a high capillarity which is an ability to resist a pulling force and high tensile strength which is the ability to rise in tubes.
Subtopic: Transpiration & Guttation |
75%
Level 2: 60%+
Hints
Control points where a plant adjusts the quantity and types of solutes that reach the xylem are:
1. Suberised casparian strips in the endodermis
2. Sclerenchyma of the pericycle
3. Transport proteins of endodermal cells
4. Root hair cells
1. Suberised casparian strips in the endodermis
2. Sclerenchyma of the pericycle
3. Transport proteins of endodermal cells
4. Root hair cells
Subtopic: Photosynthesis Transpiration Compromise & Mineral Translocation |
Level 3: 35%-60%
Hints
Consider the two statements:
Statement I: The passive movement of ions into the apoplast usually occurs through ion channels, the transmembrane proteins that function as selective pores.
Statement II: The entry or exit of ions to and from symplast requires the expenditure of metabolic energy.
1. Both Statement I and Statement II are correct
2. Both Statement I and Statement II are incorrect
3. Statement I is correct and Statement II is incorrect
4. Statement I is incorrect and Statement II is correct
Statement I: The passive movement of ions into the apoplast usually occurs through ion channels, the transmembrane proteins that function as selective pores.
Statement II: The entry or exit of ions to and from symplast requires the expenditure of metabolic energy.
1. Both Statement I and Statement II are correct
2. Both Statement I and Statement II are incorrect
3. Statement I is correct and Statement II is incorrect
4. Statement I is incorrect and Statement II is correct
Subtopic: Pathways of transport |
63%
Level 2: 60%+
Hints
In higher plants, mineral ions are:
1. translocated through xylem along with the ascending stream of water, which is pulled up through the plant by transpirational pull.
2. translocated through xylem independent of the ascending stream of water, which is pushed up through the plant by root pressure.
3. translocated through phloem along with the ascending translocation of sucrose, which is transported by bulk transport.
4. translocated through phloem independent of the ascending translocation of sucrose, which is pulled up by negative pressure.
1. translocated through xylem along with the ascending stream of water, which is pulled up through the plant by transpirational pull.
2. translocated through xylem independent of the ascending stream of water, which is pushed up through the plant by root pressure.
3. translocated through phloem along with the ascending translocation of sucrose, which is transported by bulk transport.
4. translocated through phloem independent of the ascending translocation of sucrose, which is pulled up by negative pressure.
Subtopic: Long Distance Transport of Water |
69%
Level 2: 60%+
Hints
When a carrier protein facilitates the movement of two molecules across the membrane in same direction, it is called :
1. Uniport
2. Transport
3. Antiport
4. Symport
1. Uniport
2. Transport
3. Antiport
4. Symport
Subtopic: Facilitated Diffusion |
83%
Level 1: 80%+
NEET - 2022
Hints
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 |
70%
Level 2: 60%+
NEET - 2022
Hints
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%
Level 3: 35%-60%
Hints
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%
Level 1: 80%+
Hints
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%
Level 1: 80%+
Hints
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