| 51. | The definition of osmosis is – |
A. flow of solute through a semipermeable membrane | |
B. flow of water without art | |
C. flow of solvent (water) through semipermeable membrane from least to greatest concentration | |
D. none of the above |
| 52. | A cell shrinks when it is placed in a solution containing a lot of salt, because – |
A. salt water enters the cell | |
B. water moves out by external osmosis | |
C. cytoplasm breaks down | |
D. Mineral salts break down the cell wall |
| 53. | If a cell is reduced in size when it is placed in a solution. Such a solution is |
A. hypotonic | |
B. hypertonic | |
C. isotonic | |
D. Saturated |
| 54. | A cell increases in volume when it is placed in – |
A. in an isotonic solution | |
B. in a hypertonic solution | |
C. in a hypotonic solution | |
D. None of these |
| 55. | Seeds swell when kept in water. |
A. due to broadcast | |
B. due to exploitation | |
C. due to hydrolysis | |
D. due to plasmolysis |
| 56. | Doors made of wood swell in the rainy season. |
A. due to transmission | |
B. due to exploitation | |
C. due to capillarity | |
D. due to vasoconstriction |
| 57. | Excess use of fertilizers causes death of plants. |
A. due to transmission | |
B. due to external osmosis | |
C. due to exploitation | |
D. due to inflation |
| 58. | Water is transported in plants by – |
A. by cambium | |
B. by phloem | |
C. by xylem | |
D. by epidermis |
| 59. | The water available to the roots of plants in the soil is |
A. cell water | |
B. hygroscopic water | |
C. gravity water | |
D. None of these |
| 60. | How many essential elements are required for the growth of plants? |
A. 6 | |
B. 10 | |
C. 16 | |
D. 21 |