| 61. | Seeds sown too deep in the soil usually do not germinate because |
A. they can’t get air | |
B. they don’t get nitrogen | |
C. they are under great pressure | |
D. they don’t get light |
| 62. | The center of respiration inside the cell is |
A. ribosomes | |
B. nucleus | |
C. golgi body | |
D. mitochondria |
| 63. | The end product of glycolysis is – |
A. glucose | |
B. pyruvic acid | |
C. ethyl alcohol | |
D. carbon dioxide |
| 64. | Which of the following is a plant hormone? |
A. Insulin | |
B. cytokinins | |
C. Estrogen | |
D. thyroxine |
| 65. | 2,4-D is- |
A. insecticide | |
B. Explosive | |
C. fungicide | |
D. weed killer |
| 66. | Which of the following statements is correct regarding hormones? |
A. It is a special organic compound that affects and regulates growth and metabolic activities in small amounts. | |
B. These are also called growth controlling substances. | |
C. It has different effects in different concentrations and on different organs | |
D. All the above statements are correct. |
| 67. | What is indole acetic acid? |
A. enzymes | |
B. fungicide | |
C. amino acids | |
D. auxins |
| 68. | Which statement is correct regarding auxin? |
A. This leads to apical prominence in plants | |
B. It prevents shedding of leaves | |
C. it destroys weeds | |
D. all of the above |
| 69. | By the spraying of which plant hormone can semi-fertile fruits be obtained? |
A. auxin | |
B. cytokinin | |
C. gibberellin | |
D. abscisic acid |
| 70. | Which of the following hormones induces plant cells to grow in such a way that the plant appears to be bent? |
A. cytokinin | |
B. auxin | |
C. gibberellin | |
D. abscisic acid |