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Q. No.The occurrence of which of the following events lead to the opening of stomata?
A. Lowering of osmotic potential of guard cells
B. Guard cells becoming flaccid
C. Decline in guard cell solutes
D. Rise in potassium levels in guard cells
E. Movement of water from neighboring cells into guard cells
Choose the correct answer from the options given below:
1. A, B and D only
2. B, C and D only
3. B, C and E only
4. A, D and E only
Subtopic: Stomata |
61%
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In an experiment, you measure the concentration of a polar molecule inside and outside the cell and find that the concentration of this molecule is gradually increasing inside the cell. You also measure the concentration of ATP inside the cell and find that it is dropping. Which of the following processes are you likely to be observing?
1. Active transport
2. Facilitated diffusion
3. Osmosis
4. Passive transport
1. Active transport
2. Facilitated diffusion
3. Osmosis
4. Passive transport
Subtopic: Means of Transport: Active |
78%
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The bark of a girdled tree (upto phloem) may become swollen after a few weeks because
1. Water will not move upwards
2. Water will not move downwards
3. Sugars and other organic materials will not move downwards
4. Sugars and other organic materials will not move upwards
1. Water will not move upwards
2. Water will not move downwards
3. Sugars and other organic materials will not move downwards
4. Sugars and other organic materials will not move upwards
Subtopic: Phloem Translocation |
From NCERT
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Select all routes possible for the transport of water and minerals from root hair to the xylem:
A. Transmembrane route
B. Symplastic route
C. Apoplastic route
D. Stomatal route
E. Endodermis route
Choose the correct answer from the options given below:
1. A, B, C and E only
2. B, C, D and E only
3. A, B, C and D only
4. A, B, D and E only
A. Transmembrane route
B. Symplastic route
C. Apoplastic route
D. Stomatal route
E. Endodermis route
Choose the correct answer from the options given below:
1. A, B, C and E only
2. B, C, D and E only
3. A, B, C and D only
4. A, B, D and E only
Subtopic: Water Absorption | Pathways of transport |
71%
From NCERT
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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
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
Subtopic: Water Absorption | Transpiration & Guttation | Pathways of transport | Introduction to Water Absorption |
55%
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Identify the correct statement regarding the state of plant cells shown as A, B and C in the given diagram:
| A | B | C | |
| 1. | plasmolysed | flaccid | turgid |
| 2. | plasmolysed | turgid | flaccid |
| 3. | flaccid | plasmolysed | turgid |
| 4. | turgid | flaccid | plasmolysed |
Subtopic: Plasmolysis |
83%
From NCERT
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I: After plasmolysis, the gap between the cell wall and the cell membrane in a plant cell is filled with hypertonic solution.
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
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
Subtopic: Plasmolysis |
73%
From NCERT
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Identify the incorrect statement:
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
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
Subtopic: Water Absorption |
From NCERT
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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 |
Subtopic: Pathways of transport |
81%
From NCERT
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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%
From NCERT
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