E-PolyLearning

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)

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

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

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

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)