E-PolyLearning

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

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

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

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

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