| 81. | What is the principle related to absorption of water by soil? |
A. compaction | |
B. capillary action | |
C. theory of absorption | |
D. suction action |
| 82. | The form in which plants obtain nitrogen is |
A. nitric oxide | |
B. nitrate | |
C. ammonia | |
D. nitride |
| 83. | The name of the small holes found on the leaf surface of plants is – |
A. trough | |
B. stoma | |
C. dermis | |
D. stoma |
| 84. | Dwarf plants can be made taller by the application of |
A. gibberellins | |
B. auxin | |
C. cytokinin | |
D. Darmin |
| 85. | Which molecule is present in plants similar to hemoglobin in animals? |
A. carotene | |
B. cytochrome | |
C. cellulose | |
D. chlorophyll |
| 86. | 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 |
| 87. | 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 |
| 88. | 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 |
| 89. | 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 |
| 90. | Seeds swell when kept in water. |
A. due to broadcast | |
B. due to exploitation | |
C. due to hydrolysis | |
D. due to plasmolysis |