E-PolyLearning

86. For most bacteria, the optimum pH for growth lies between
a. 6.5-7.5
b. 3.5-4.5
c. 4.5-5.5
d. 5.5-6.5
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Answer: (a).6.5-7.5

87. Which of the following is an abiotic elicitors?
a. UV irradiation
b. Osmotic shock
c. Heavy metal ions
d. All of these
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Answer: (d).All of these

88. Suspension cultures consist of cells and cell aggregates, growing dispersed in
a. liquid medium
b. solid nutrient medium
c. solid or liquid medium
d. none of these
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Answer: (a).liquid medium

89. Thiobacillus thiooxidans has an optimum pH of
a. 2.0-3.5
b. 0.5-6.0
c. 6.5-7.5
d. 9.0-9.5
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Answer: (a).2.0-3.5

90. Balanced growth is defined as
a. cultures undergoing balanced growth while maintaining a constant chemical composition
b. balancing the growth while controlling the pH
c. balancing the growth while controlling the temperature
d. balancing the growth while changing the nutrient composition
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Answer: (a).cultures undergoing balanced growth while maintaining a constant chemical composition