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Microbes in Human Welfare · Question 72

AIPMT 2002MCQEasy📈 Topic in 0% papers+4−1
1

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)

AIPMT 2002

Keep practising — Microbes in Human Welfare

2

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
AIPMT 2002
3

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
AIPMT 2001
4

Which aquatic fern performs nitrogen fixation?

  1. Azolla
  2. Nostoc
  3. Salvia
  4. Salvinia
Out of syllabusAIPMT 2001
5

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 syllabusAIPMT 2001
6

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

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

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

  1. Saccharomyces
  2. Lactobacillus
  3. Azotobacter
  4. Penicillium
AIPMT 2000

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