| 66. | To maintain the pH of the culture |
| a. | organic acid such as citric, fumaric, malic and succinic acid is used |
| b. | synthetic buffers such as Tris, MES or HEPS are used |
| c. | both (a) and (b) |
| d. | ammonium salts are used |
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Answer: (c).both (a) and (b)
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| 67. | Which of the following is not a cytokinin? |
| a. | 2,4-dichlorophenoxyacetic acid |
| b. | 6 benzylaminopurine |
| c. | Zeatin |
| d. | Kinetin |
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Answer: (a).2,4-dichlorophenoxyacetic acid
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| 68. | Which of the following is not an auxin? |
| a. | Indole acetic acid (IAA) |
| b. | Naphthalenacetic acid (NAA) |
| c. | zeatin |
| d. | Indole butyric acid |
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Answer: (c).zeatin
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| 69. | Which of the following is not true about nurse or conditioned medium? |
| a. | It is liquid removed from the suspension of fast growing cells |
| b. | It contains uncharacterized growth factor released by growing cells |
| c. | It is used in the culture of regenerating protoplast |
| d. | it is removed aseptically from the culture and is autoclaved before use |
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Answer: (d).it is removed aseptically from the culture and is autoclaved before use
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| 70. | Very high sugar concentration (40-100 g/l) have been used |
| a. | in specialized secondary metabolite production |
| b. | to adjust the osmotic potential of the media in short term treatment for regeneration |
| c. | Both (a) and (b) |
| d. | none of these |
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Answer: (c).Both (a) and (b)
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