Q. No.Unlike a symporter and an antiporter, a uniporter:
1. is not an integral membrane protein
2. is a cell surface carbohydrate
3. is not a co-transporter
4. cannot be used for active transport
1. is not an integral membrane protein
2. is a cell surface carbohydrate
3. is not a co-transporter
4. cannot be used for active transport
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Consider the following statements:
| I. | Pure water is usually defined as having a solute potential (Ψπ)of zero. |
| II. | A solution will have a lower and hence more negative water potential than that of pure water. |
| III. | The more solute molecules present, the more negative the solute potential is. |
Correct statements are:
1. I and II
2. I and III
3. II and III
4. I, II and III
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Consider the following statements regarding water potential:
I. Water potential is the potential energy of water relative to pure free water (e.g., deionized water)
in reference conditions.
II. Typically, pure water at standard temperature and pressure (or other suitable reference condition) is defined as having a water potential of 0.
III. The addition of solutes to water increases its potential (makes it more negative), just as the increase in pressure lowers its potential (makes it more positive).
The correct statements are:
| 1. I, II and III | 2. I and II |
| 3. I and III | 4. II and III |
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The pressure that must be applied to a solution to prevent the inward flow of water across a semi permeable membrane is called as:
1. Hydrostatic pressure
2. Water potential
3. Osmotic pressure
4. Osmotic potential
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For imbibition to occur, affinity between the adsorbant and the liquid is:
1. not essential
2. not essential since imbitition is also a diffusion
3. not essential if occurring against the concentration gradient
4. a pre-requisite
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In the mycorrhizal symbiotic relationship, the root provides the fungus with:
| 1. Water | 2. Phosphorus |
| 3. N – containing compounds | 4. Sodium and potassium |
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The greatest contribution of root pressure in water transport in plants most likely is that it:
| 1. | pushes water to the top at night |
| 2. | pushes water to the top of the plant when the rate of transpiration is low |
| 3. | re-establishes the continuous chain of water molecules in the xylem |
| 4. | pushes water into the endodermal cells changing the transport from apoplast to symplast |
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In a guard cell:
I. The outer walls are thick and elastic
II. Cellulose microfibrils are oriented longitudinally
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
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Cohesion, adhesion and surface tension provide water with a high tensile strength that means that it:
1. is capable of rising in a thin tube
2. has a low specific heat
3. resists a pulling force
4. is a universal polar solvent
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The evolution of C4 photosynthetic system is probably one of the strategies for:
| 1. | maximizing the availability of oxygen in spite of continuing high amount of water loss |
| 2. | maximizing availability of water in spite of continuing high amount of carbon dioxide loss |
| 3. | reducing the amount of water loss but leads to decreased availability of carbon dioxide |
| 4. | maximizing the availability of carbon dioxide while minimizing water loss |
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