Q. No.A column of water within xylem vessels of tall trees does not break under its weight because of
1. Dissolved sugar in water
2. Tensile strength of water
3. Lignification of xylem vessels
4. Positive root pressure
1. Dissolved sugar in water
2. Tensile strength of water
3. Lignification of xylem vessels
4. Positive root pressure
Match List - I with List-II.
| List-I | List-II | ||
| (a) | Cohesion | (i) | More attraction in liquid phase |
| (b) | Adhesion | (ii) | Mutual attraction among water molecules |
| (c) | Surface tension | (iii) | Water loss in liquid phase |
| (d) | Guttation | (iv) | Attraction towards polar surfaces |
Choose the correct answer from the options given below.
| (a) | (b) | (c) | (d) | |
| 1. | (iii) | (i) | (iv) | (ii) |
| 2. | (ii) | (i) | (iv) | (iii) |
| 3. | (ii) | (iv) | (i) | (iii) |
| 4. | (iv) | (iii) | (ii) | (i) |
Root pressure develops due to
1. Active absorption
2. Low osmotic potential in soil
3. Passive absorption
4. Increase in transpiration
Osmotic potential and water potential of pure water are, respectively :
| 1. 0 and 0 | 2. 0 and 1 |
| 3. 100 and 0 | 4. 100 and 100 |
The movement of ions against the concentration gradient will be:
| 1. Active transport | 2. Osmosis |
| 3. Diffusion | 4. All of the above |
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What will be the direction of flow of water when a plant cell is placed in a hypotonic solution?
1. Water will flow in both directions.
2. Water will flow out of the cell.
3. Water will flow into the cell.
4. No flow of water will happen in any direction.
In plants, the pressure component of water potential is most often negative in:
| 1. Stem xylem | 2. Leaf mesophyll |
| 3. Root cortex | 4. Root epidermis |
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The opening of stomata is facilitated by:
1. uptake of H+ ions by guard cells
2. loss of K+ ions from the guard cells
3. radial orientation of cellulose microfibrils in the cell walls of the guard cells
4. loss of turgor in the guard cells
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In the cohesion-tension-transpiration pull model, the upward pull of water is transmitted to other water molecules by cohesion which is caused by:
| 1. Hydrogen bonds | 2. Hydrophilic cell walls |
| 3. Turgor pressure | 4. Osmosis |
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