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Microbes in Human Welfare

AIPMT 2002MCQEasyNot asked in last 5 yrs+4−1
Ques. 1AIPMT 2002

Which bacteria is utilized in Gobar gas plant ?

  1. Nitrifying bacteria
  2. Methanogens
  3. Ammonifying bacteria
  4. Denitrifying bacteria

Answer

(2) Methanogens

Solution

Gobar gas (biogas) is a mixture of gases, predominantly methane, produced by microbial activity on cattle dung.

As per NCERT, certain bacteria which grow anaerobically on cellulosic material produce large amounts of methane along with CO2 and H2; these are collectively called methanogens, e.g. Methanobacterium.

∴ Methanogens are utilised in a gobar gas plant.

Answer: (2)

Keep practising — Microbes in Human Welfare

Ques. 2AIPMT 2002

During the formation of bread it becomes porous due to release of CO2 by the action of : -

  1. Protozoans
  2. Bacteria
  3. Yeast
  4. Virus
Ques. 3AIPMT 2001

Which of the following is a true pair of biofertilizers?

  1. Nostoc and legume
  2. Rhizobium and grasses
  3. Salmonella and E. coli
  4. Azolla and BGA
Ques. 4AIPMT 2001

Which aquatic fern performs nitrogen fixation?

  1. Azolla
  2. Nostoc
  3. Salvia
  4. Salvinia
Out of syllabus
Ques. 5AIPMT 2001

What is B.O.D.?

  1. The total amount of O2 present in water
  2. The amount of O2 utilised by organisms in water
  3. The amount of O2 utilised by microorganisms for decomposition
  4. All of the above
Out of syllabus
Ques. 6AIPMT 2000

Which aquatic fern is used to increase the yield in paddy crop?

  1. Salvinia
  2. Isoetes
  3. Marsilea
  4. Azolla
Ques. 7AIPMT 2000

Which of the following is used to manufacture ethanol from starch?

  1. Saccharomyces
  2. Lactobacillus
  3. Azotobacter
  4. Penicillium

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