Q. No.
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.
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
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 |
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. |
Match the following and choose the correct option.
|
Column I |
Column II |
|
A. Leaves |
(i) Anti – transpirant |
|
B. Seed |
(ii) Transpiration |
|
C. Roots |
(iii)Negative osmotic potential |
|
D. Aspirin |
(iv) Imbibition |
|
E. Plasmolysed Cell |
(v) Absorption |
Codes
1. A-ii, B-iv, C-v, D-i, E-iii
2. A-iii, B-ii, C-iv, D-i, E-v
3. A-i, B-ii, C-iii, D-iv, E-v
4. A-v, B-iv, C-iii, D-ii, E-i
Based on the figure given below, which of the following statements is not correct?
| 1. | Movement of solvent molecules will take place from chamber A to B. |
| 2. | Movement of solute will take place from A to B. |
| 3. | Presence of a semipermeable membrane is a pre-requisite for this process to occur. |
| 4. | The direction and rate of osmosis depend on both the pressure gradient and concentration gradient. |
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