Guttation is the result of:
1. Root pressure
2. Diffusion
3. Transpiration
4. Osmosis
Function of companion cells is:
1. | Loading of sucrose into sieve elements |
2. | Providing energy to sieve elements for active transport |
3. | Providing water to phloem |
4. | Loading of sucrose into sieve elements by passive transport |
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
What shall be the water potential of a root hair cell absorbing water from the soil?
1. Zero
2. Less than zero
3. More than zero
4. Infinite
Casparian bands are found in:
1. | Endodermis | 2. | Pericycle |
3. | Periderm | 4. | Cortex |
The movement of ions against the concentration gradient will be:
1. Active transport | 2. Osmosis |
3. Diffusion | 4. All of the above |
Opening and closing of stomata are due to the:
1. Hormonal change in guard cells
2. Change in Turgor pressure of guard cells
3. Gaseous exchange
4. Respiration
Loading of phloem is related to:
1. Increase of sugar in phloem
2. Elongation of phloem cell
3. Separation of phloem parenchyma
4. Strengthening of phloem fiber
When water moves through a semipermeable membrane then which of the following pressure develops:
1. O.P.
2. S.P.
3. T.P.
4. W.P.
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. |