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Q. No.Which means of transport is very important to plants since it is the only means for gaseous movement within the plant body?
1.
Diffusion
2.
Facilitated diffusion
3.
Active transport
4.
Secondary active co-transport
Subtopic: Diffusion |
88%
From NCERT
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All the following are purposes served by transpiration in plants except:
| 1. | It creates transpiration pull for absorption and transport in plants. |
| 2. | It supplies water for photosynthesis. |
| 3. | It warms leaf surfaces to activate enzymes for carbon fixation. |
| 4. | It maintains the shape and structure of the plants by keeping cells turgid. |
Subtopic: Transpiration & Guttation |
82%
From NCERT
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Match each item in COLUMN I with one in COLUMN II and select the correct match from the codes given:
Codes:
| COLUMN I [Property of water] |
COLUMN II [Description] |
||
| A | Cohesion | P | An ability to resist a pulling force |
| B | Adhesion | Q | The ability to rise in thin tubes |
| C | Tensile strength | R | Mutual attraction between water molecules |
| D | Capillarity | S | Attraction of water molecules to polar surfaces |
| A | B | C | D | |
| 1. | R | S | P | Q |
| 2. | R | S | Q | P |
| 3. | P | Q | R | S |
| 4. | P | Q | S | R |
Subtopic: Transpiration & Guttation |
91%
From NCERT
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Consider the given two statements:
| Statement I: | At the source sugars are actively transported in to a sieve tube. |
| Statement II: | At the sink incoming sugars are passively transported out of the phloem. |
| 1. | Statement I is incorrect; Statement II is incorrect |
| 2. | Statement I is incorrect; Statement II is correct |
| 3. | Statement I is correct; Statement II is incorrect |
| 4. | Statement I is correct; Statement II is correct |
Subtopic: Phloem Translocation |
73%
From NCERT
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In terms of fixing carbon dioxide, when compared to a C3 plant, a C4 plant:
| 1. | is twice as efficient and loses only half as much water for the same amount of carbon dioxide fixed. |
| 2. | is equally efficient and loses only half as much water for the same amount of carbon dioxide fixed. |
| 3. | is twice as efficient and loses same amount of water for the same amount of carbon dioxide fixed. |
| 4. | is equally efficient and loses same amount of water for the same amount of carbon dioxide fixed. |
Subtopic: Photosynthesis Transpiration Compromise & Mineral Translocation |
89%
From NCERT
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When water flows into the cell and out of the cell and are in equilibrium, the cells are said to be:
1. Flaccid
2. Plasmolysed
3. Turgid
4. Wilted
Subtopic: Plant Water Relations: Plasmolysis |
79%
From NCERT
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In facilitated diffusion, membrane proteins:
| I: | provide sites at which molecules cross the membrane against the concentration gradient. |
| II: | set up a concentration gradient for diffusion to occur. |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Facilitated Diffusion |
From NCERT
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By convention, the water potential of pure water at standard temperatures, which is not under any pressure, is take to be:
1. 0 MPa
2. 760 Mpa
3. - 5 Mpa
4. 1.0 MPa
Subtopic: Plant Water Relations: Water Potential: DPD |
88%
From NCERT
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Consider the two given statements regarding mass or bulk flow in plants:
| Statement I: | It is a characteristic of mass flow that substances, whether in solution or in suspension, are swept along at the same pace. |
| Statement II: | Bulk flow can be achieved only through a negative hydrostatic pressure gradient. |
| 1. | Statement I is correct; Statement II is incorrect |
| 2. | Statement I is correct; Statement II is correct |
| 3. | Statement I is incorrect; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is correct |
Subtopic: Phloem Translocation: Short Distance Transport | Phloem Translocation |
70%
From NCERT
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When a carrier protein facilitates the movement of two molecules across the membrane in opposite direction, it is called :
1. Uniport
2. Transport
3. Antiport
4. Symport
1. Uniport
2. Transport
3. Antiport
4. Symport
Subtopic: Means of Transport: Active | Means of Transport: Passive |
92%
From NCERT
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