Q. No.Consider the given two statements:
I. Over small distances, in plants, substances move by diffusion and by cytoplasmic streaming supplemented by active transport.
II. Transport over long distances, in plants, proceeds through the vascular system and is called as transpiration.
1. Only I is correct
2. Only I is incorrect
3. Both I and II are correct
4. Both I and II are incorrect
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| A | B | C | |
| 1. | plasmolysed | flaccid | turgid |
| 2. | plasmolysed | turgid | flaccid |
| 3. | flaccid | plasmolysed | turgid |
| 4. | turgid | flaccid | plasmolysed |
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II: If a plant cell is placed in a hyotonic solution, the plant cell loses water and hence turgor pressure by plasmolysis.
1. I is correct and II is also correct and II explains I
2. I is correct but II is incorrect
3. I is incorrect and II is incorrect
4. I is incorrect and II is correct
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I. Root hairs are thin walled slender extensions of root epidermal cells that greatly increase the surface area for absorption.
II. Water is absorbed along with mineral solutes, by the root hairs, by diffusion as well as by active transport aided by cytoplasmic streaming.
1. Only I
2. Only II
3. Neither I nor II
4. Both I and II
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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 |
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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.
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1. Suberised casparian strips in the endodermis
2. Sclerenchyma of the pericycle
3. Transport proteins of endodermal cells
4. Root hair cells
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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
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| 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 |
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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
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