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Q. No.Plasmolysis:
I. occurs when a plant cell [or tissue] is placed in a hypotonic solution.
II. water is first lost from the cytoplasm and then from the vacuole.
III. is usually reversible
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Â Plasmolysis |
 74%
Level 2: 60%+
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Identify the incorrect statement:
1. Pinus seeds cannot germinate and establish without the presence of mycorrhizae
2. Imbibition is a special type of diffusion
3. Bulk transport can be achieved only through a positive hydrostatic pressure
4. Numerically, osmotic pressure is equivalent to the osmotic potential, but the sign is opposite
1. Pinus seeds cannot germinate and establish without the presence of mycorrhizae
2. Imbibition is a special type of diffusion
3. Bulk transport can be achieved only through a positive hydrostatic pressure
4. Numerically, osmotic pressure is equivalent to the osmotic potential, but the sign is opposite
Subtopic: Â Radial Transport |
 82%
Level 1: 80%+
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Water has some important physical properties. Water molecules are attracted to each other in the liquid phase more than to water in the gas phase. This is called as:
1. Cohesion
2. Adhesion
3. Adnation
4. Surface tension
1. Cohesion
2. Adhesion
3. Adnation
4. Surface tension
Subtopic: Â Transpiration & Guttation |
 56%
Level 3: 35%-60%
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What is not true regarding diffusion in context of biology?
1. Molecules move in a random fashion with a net result that substance move from regions of higher concentration to regions of lower concentration.
2. No ATP energy expenditure takes place.
3. It is a very rapid process dependent on a living system.
4. It is the only means for gaseous transport in plant cells.
1. Molecules move in a random fashion with a net result that substance move from regions of higher concentration to regions of lower concentration.
2. No ATP energy expenditure takes place.
3. It is a very rapid process dependent on a living system.
4. It is the only means for gaseous transport in plant cells.
Subtopic: Â Diffusion |
 83%
Level 1: 80%+
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The innermost layer of the cortex in the roots that restricts the apoplastic transport of water inside is called as:
1. Hypodermis
2. Endodermis
3. Pericycle
4. Stele
1. Hypodermis
2. Endodermis
3. Pericycle
4. Stele
Subtopic: Â Water Absorption |
 86%
Level 1: 80%+
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What would be incorrect for phloem in angiosperms?
1. Phloem fibres, at maturity, lose their protoplasm and become dead.
2. The function of sieve tubes is controlled by the nucleus of companion cell.
3. The direction of movement in the phloem can be bi-directional.
4. Phloem sap is mainly water and starch.
1. Phloem fibres, at maturity, lose their protoplasm and become dead.
2. The function of sieve tubes is controlled by the nucleus of companion cell.
3. The direction of movement in the phloem can be bi-directional.
4. Phloem sap is mainly water and starch.
Subtopic: Â Phloem Translocation: Short Distance Transport |Â Phloem Translocation |
 70%
Level 2: 60%+
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Apoplastic movement of water in plants:
| 1. | involves crossing the cell membrane multiple times |
| 2. | is through mass flow |
| 3. | accounts for a very small fraction of water flow in roots |
| 4. | is relatively much slower than the symplastic flow |
Subtopic: Â Water Absorption |
 61%
Level 2: 60%+
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Identify the correct statement:
| 1. | Unlike facilitated transport, simple diffusion requires special membrane proteins |
| 2. | Both simple diffusion and facilitated transport are highly selective |
| 3. | Facilitated transport is an uphill transport and requires ATP energy |
| 4. | Both facilitated transport and active transport are liable to saturate |
Subtopic: Â Diffusion |Â Means of Transport: Active |Â Means of Transport: Passive |
 81%
Level 1: 80%+
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Which of the following statements is correct regarding diffusion:
| 1. | Diffusion of solids rather than diffusion in solids is more likely. |
| 2. | The diffusion rate depends upon the size of the substances; smaller substances diffuse slower |
| 3. | Diffusion is dependent on a living system |
| 4. | Movement by diffusion is passive and no energy expenditure takes place in the process |
Subtopic: Â Diffusion |Â Means of Transport: Passive |
 79%
Level 2: 60%+
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Which one of the following is essential for the process of imbibition to take place?
| I: | Water potential gradient between the adsorbent and the liquid imbibed |
| II: | Affinity between the absorbent and the liquid |
| III: | Affinity between the adsorbent and the liquid |
| IV: | Water potential gradient between the absorbent and the liquid imbibed |
| 1. | Only III and IV | 2. | Only I and II |
| 3. | Only I and III | 4. | Only II and IV |
Subtopic: Â Imbibition |
Level 4: Below 35%
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