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 |
Select the incorrect statement.
1. | Transport of molecules in phloem can be bidirectional. |
2. | The movement of minerals in the xylem is unidirectional. |
3. | Unloading of sucrose at the sink does not involve the utilization of ATP. |
4. | Elements most easily mobilized in plants from one region to another are phosphorus, sulfur, nitrogen, and potassium. |