Growth And Nutrition Of Bacteria(Microbiology ) Questions and Answers

Question 1. Which of the following is not the characteristic of a growth curve?
  1.    Shows development of microbial population under relatively stable environmental conditions
  2.    Graphs numbers of microbes versus time
  3.    Each growth curve consists of four distinct phases
  4.    Plotted with logarithmic numbers
Explanation:-
Answer: Option C. -> Each growth curve consists of four distinct phases
Question 2. The organism which obtain their energy from chemicals are designated as
  1.    chemotrophs
  2.    organotrophs
  3.    autotrophs
  4.    prototrophs
Explanation:-
Answer: Option A. -> chemotrophs
Question 3. Generation time of Escherichia coli is
  1.    20 days
  2.    200 hours
  3.    20 hours
  4.    20 minutes
Explanation:-
Answer: Option D. -> 20 minutes
Question 4. The organism which grows best above 45°C are called
  1.    psychrophilic
  2.    any of these
  3.    mesosphilic
  4.    thermophilic
Explanation:-
Answer: Option D. -> thermophilic
Question 5. Nutrient content and biological structures are considered as
  1.    processing factor
  2.    None of these
  3.    implicit factor for microbial growth
  4.    intrinsic factor for microbial growth
Explanation:-
Answer: Option D. -> intrinsic factor for microbial growth
Question 6. Implicit factors
  1.    can be synergistic
  2.    depend on developing microflora
  3.    None of these
  4.    both (a) and (b)
Explanation:-
Answer: Option D. -> both (a) and (b)
Question 7. Lag phase is also known as
  1.    generation time
  2.    transitional period
  3.    none of these
  4.    period of initial adjustment
Explanation:-
Answer: Option D. -> period of initial adjustment
Question 8. Some organisms can use reduced inorganic compounds as electron donors and are termed as
  1.    lithotrophs
  2.    phototrophs
  3.    photo-organotrophs
  4.    chemotrophs
Explanation:-
Answer: Option A. -> lithotrophs
Question 9. A microbe, which grows at temperatures above 95° C is most likely to be
  1.    a protozoan
  2.    an archaean
  3.    none of these
  4.    a fungus
Explanation:-
Answer: Option B. -> an archaean
Question 10. Which of the following is used to grow bacterial cultures continuously?
  1.    Chemostat
  2.    Hemostat
  3.    Coulter Counter
  4.    Petroff-Hausser chamber
Explanation:-
Answer: Option A. -> Chemostat
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