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Microbes in Human Welfare · Question 73

AIPMT 2002MCQEasy📈 Topic in 25% papers+4−1
1

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

Answer

(3) Yeast

Solution

As per NCERT, the dough used for making bread is fermented using baker's yeast, Saccharomyces cerevisiae.

⇒ Yeast ferments the sugars of the dough: C6H12O6 2C2H5OH + 2CO2

∴ The CO2 released puffs up the dough and makes the bread porous.

Answer: (3)

AIPMT 2002

Keep practising — Microbes in Human Welfare

2

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
3

Which aquatic fern performs nitrogen fixation?

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

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
5

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

  1. Salvinia
  2. Isoetes
  3. Marsilea
  4. Azolla
AIPMT 2000
6

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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