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
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 |
Statement I: | The forces generated by transpiration can lift a xylem-sized column of water over 130 meters height. |
Statement II: | Transpiration cools leaf surfaces sometimes 10 to 15 degrees, by evaporative cooling. |
1. | Active Transport | 2. | Osmosis |
3. | Facilitated Diffusion | 4. | Passive Transport |
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 |
Options: | A | B | C | D |
1. | II | I | IV | III |
2. | II | IV | I | III |
3. | IV | III | II | I |
4. | III | I | IV | II |
A: | Mass flow is faster than diffusion. |
B: | Mass flow is the result of pressure difference between the end points. |
C: | Different substances involved in mass flow move at different paces. |
D: | Mass flow can result through either a positive or a negative hydrostatic pressure gradient. |
1. | (A), (C), (D) only | 2. | (B), (C), (D) only |
3. | (A), (B), (C) only | 4. | (A), (B), (D) only |
1. | in same direction with the help of different carriers located at a common site |
2. | in same direction with the help of different carriers located at different sites in the same cell |
3. | in same direction with the help of same carrier |
4. | in opposite direction with the help of same carrier |
I: | The process of translocation through phloem is unidirectional but through xylem, it is bidirectional |
II: | The most readily mobilized elements are phosphorus, sulphur, nitrogen and potassium. |
Assertion (A): | Transport in xylem and phloem is unidirectional and multidirectional, respectively. |
Reason (R): | In a flowering plant there is complex traffic of compounds moving in different directions. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |