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Microbes in Human Welfare · Question 61

AIPMT 2007MCQEasy📈 Topic in 25% papers+4−1
1

Probiotics are-

  1. Cancer inducing microbes
  2. New kind of food allergens
  3. Live microbial food supplement
  4. Safe antibiotics

Answer

(3) Live microbial food supplement

Solution

Probiotics are live microorganisms which, when taken in adequate amounts with food, benefit the health of the host.

⇒ As per NCERT, Lactic acid bacteria (LAB), which convert milk to curd, also improve its nutritional quality by increasing vitamin B12, and in our stomach LAB play a very beneficial role in checking disease-causing microbes.

∵ Curd and yoghurt containing such live bacteria (e.g., Lactobacillus) are taken as food supplements.

∴ Probiotics are live microbial food supplements.

Answer: (3)

AIPMT 2007

Keep practising — Microbes in Human Welfare

2

Which one of the following pairs is wrongly matched ?

  1. Methanogens – Gobar gas
  2. Yeast – Ethanol
  3. Streptomycetes – Antibiotic
  4. Coliforms – Vinegar
AIPMT 2007
3

Which one of the following statements is correct?

  1. Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and potassium for plant nutrition in soil
  2. Both Azotobacter and Rhizobium fix atmospheric nitrogen in root nodules of plants
  3. At present it is not possible to grow maize without chemical fertilizers
  4. Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies
Out of syllabusAIPMT 2007
4

Curing of tea leaves is brought about by the activity of

  1. fungi
  2. bacteria
  3. mycorrhiza
  4. viruses
AIPMT 2006
5

For retting of jute the fermenting microbe used is

  1. methanophilic bacteria
  2. butyric acid bacteria
  3. Helicobacter pylori
  4. Streptococcus lactis.
AIPMT 2005
6

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
7

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
8

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
9

A major component of gobar gas is

  1. ethane
  2. methane
  3. butane
  4. ammonia
AIPMT 2004
10

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
11

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

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