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MCQs

Total Questions : 41 | Page 3 of 5 pages
Question 21.  Which of the following is an abiotic elicitors?
  1.    UV irradiation
  2.    Osmotic shock
  3.    Heavy metal ions
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 22.  Balanced growth is defined as
  1.    cultures undergoing balanced growth while maintaining a constant chemical composition
  2.    balancing the growth while controlling the pH
  3.    balancing the growth while controlling the temperature
  4.    balancing the growth while changing the nutrient composition
 Discuss Question
Answer: Option A. -> cultures undergoing balanced growth while maintaining a constant chemical composition
Question 23.  Thiobacillus thiooxidans has an optimum pH of
  1.    2.0-3.5
  2.    0.5-6.0
  3.    6.5-7.5
  4.    9.0-9.5
 Discuss Question
Answer: Option A. -> 2.0-3.5
Question 24.  Semi-solid media, prepared with agar at concentrations of 0.5% or less are useful for the cultivation of
  1.    Microaerophillic bacteria
  2.    Lactobacilli
  3.    E.coli
  4.    all of these
 Discuss Question
Answer: Option A. -> Microaerophillic bacteria
Question 25.  
The cell mass can be measured optically by determining the amount of light scattered by a suspension of cells. The measurements are usually at a wavelength of
  1.    300-400nm
  2.    400-500nm
  3.    500-600nm
  4.    600-700nm
 Discuss Question
Answer: Option C. -> 500-600nm
Question 26. . Callus cultures are amorphous cell aggregates arising from the unorganized growth of explants on an
  1.    liquid medium
  2.    solid nutrient medium
  3.    aseptic solid nutrient medium
  4.    solid or liquid medium
 Discuss Question
Answer: Option C. -> aseptic solid nutrient medium
Question 27.  Which of the following is not an indirect method for the measurement of cell mass?
  1.    Nutrient composition
  2.    Cell dry weight
  3.    Viscosity
  4.    Heat evolution
 Discuss Question
Answer: Option B. -> Cell dry weight
Question 28. . The size of a single plant cell is usually within the range of
  1.    10-20μm in diameter and 25-100μm long
  2.    20-40μm in diameter and 100-200μm long
  3.    40-60μm in diameter and 200-300μm long
  4.    60-80μm in diameter and 300-400μm long
 Discuss Question
Answer: Option B. -> 20-40μm in diameter and 100-200μm long
Question 29. . The protoplast can be used to
  1.    modify genetic information
  2.    create plant hybrid
  3.    study plant viral infections
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Question 30. . Which of the following is incorrect?
  1.    Plant cells are larger than the bacterial or fungus cells
  2.    Plant cells tend to grow in clumps
  3.    Plant cells are less sensitive to shear than microbial cells
  4.    Plant cells are more genetically unstable than microbial cells
 Discuss Question
Answer: Option C. -> Plant cells are less sensitive to shear than microbial cells

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