| 76. | Nitrogen in the plant cell culture media is provided by either ammonia or nitrate salt. In the media |
| a. | utilization of ammonium cause culture pH to drop while utilization of nitrate cause culture pH to rise |
| b. | utilization of nitrate cause culture pH to drop while utilization of ammonium cause culture pH to rise |
| c. | utilization of both ammonium and nitrate result in rise in pH |
| d. | utilization of both ammonium and nitrate result in drop in pH |
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Answer: (a).utilization of ammonium cause culture pH to drop while utilization of nitrate cause culture pH to rise
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| 77. | Which of the following growth regulator is added for short initiation during plant regeneration from callus? |
| a. | Auxins |
| b. | Cytokinins |
| c. | Gibberellins |
| d. | Brassinosteroids |
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Answer: (b).Cytokinins
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| 78. | Which of the following growth regulator promote cell division? |
| a. | Auxins |
| b. | Cytokinins |
| c. | Gibberellins |
| d. | Brassinosteroids |
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Answer: (b).Cytokinins
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| 79. | Which of the following growth regulator is used to stimulate embryo or shoot development? |
| a. | Auxins |
| b. | Cytokinins |
| c. | Gibberellins |
| d. | Brassinosteroids |
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Answer: (c).Gibberellins
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| 80. | Which of the following growth regulator cause plant cells to grow? |
| a. | Auxins |
| b. | Cytokinins |
| c. | Gibberellins |
| d. | Brassinosteroids |
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Answer: (a).Auxins
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