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Microbes in Human Welfare · Question 65

AIPMT 2005MCQMedium📈 Topic in 75% papers+4−1
1

For retting of jute the fermenting microbe used is

  1. methanophilic bacteria
  2. butyric acid bacteria
  3. Helicobacter pylori
  4. Streptococcus lactis.

Answer

(2) butyric acid bacteria

Solution

Retting is the loosening of fibres from the stem by microbial decomposition of the pectin (middle lamella) that binds them.

⇒ In jute retting this fermentation is done by butyric acid bacteria such as Clostridium butyricum.

∵ Helicobacter pylori causes peptic ulcers, Streptococcus lactis is a lactic acid bacterium and methanogens produce biogas, none of them is used for retting.

Answer: (2)

AIPMT 2005

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2

A free living nitrogen-fixing cyanobacterium which can also form symbiotic association with the water fern Azolla is

  1. Tolypothrix
  2. Chlorella
  3. Nostoc
  4. Anabaena
AIPMT 2004
3

Dough kept overnight in warm weather becomes soft and spongy because of :-

  1. Cohesion
  2. Absorption of carbon dioxide from atmosphere
  3. Osmosis
  4. Fermentation
AIPMT 2004
4

Which one of the following pairs is not correctly matched ?

  1. Spirulina – Single cell protein
  2. Streptomyces – Antibiotic
  3. Rhizobium – Biofertilizer
  4. Serratia – Drug addiction
AIPMT 2004
5

A major component of gobar gas is

  1. ethane
  2. methane
  3. butane
  4. ammonia
AIPMT 2004
6

Which of the following plants are used as green manure in crop fields and in sandy soils ?

  1. Calotropis procera and Phyllanthus niruri
  2. Dichanthium annulatum and Azolla nilotica
  3. Saccharum munja and Lantana camara
  4. Crotalaria juncea and Alhagi camelorum
AIPMT 2003
7

During anaerobic digestion of organic waste, such as in producing biogas, which one of the following is left undegraded :-

  1. Lignin
  2. Cellulose
  3. Hemi-cellulose
  4. Lipids
AIPMT 2003
8

Which bacteria is utilized in Gobar gas plant ?

  1. Nitrifying bacteria
  2. Methanogens
  3. Ammonifying bacteria
  4. Denitrifying bacteria
AIPMT 2002
9

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
10

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
11

Which aquatic fern performs nitrogen fixation?

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

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