E-PolyLearning

71. What is 'nurse' or conditioned medium?
a. It is the media full of growth factors used for the growth of cells
b. It is the medium added to nurse the callus culture
c. Both (a) and (b)
d. It is the liquid medium removed from the suspension of fast growing cells
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Answer: (d).It is the liquid medium removed from the suspension of fast growing cells

72. What are the macronutrients used in plant cell culture medium?
a. N, P, K, S, Na
b. N, P, K, Ca, Cl
c. N, P, K, S, Ca
d. N, P, Ca, Na, Cl
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Answer: (c).N, P, K, S, Ca

73. Neutralized activated charcoal is occasionally added to young regenerating cultures to
a. remove toxic phenolics produced by the stressed plant cell
b. help to remove plants growth regulators introduced at an earlier stage
c. both (a) and (b)
d. maintain the pH of the medium
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Answer: (c).both (a) and (b)

74. Which is the most common carbon source used in the plant cell culture media?
a. Sucrose
b. Glucose
c. Fructose
d. Maltose
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Answer: (a).Sucrose

75. Which of the following is an ethylene biosynthesis inhibitor?
a. Citric acid
b. Succinic acid
c. Activated charcoal
d. Silver thiosulphate
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Answer: (d).Silver thiosulphate