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Microbes in Human Welfare · Question 54

AIPMT 2009MCQEasy📈 Topic in 12% papers+4−1
1

Which of the following is a symbiotic nitrogen fixer?

  1. Azotobacter
  2. Frankia
  3. Azolla
  4. Glomus

Answer

(2) Frankia

Solution

As per NCERT, Frankia is a nitrogen-fixing microbe that lives in symbiotic association and produces nitrogen-fixing root nodules on non-leguminous plants such as Alnus.

∵ Azotobacter fixes nitrogen while free-living in the soil; Azolla is a water fern that only houses the symbiotic cyanobacterium Anabaena; Glomus is a mycorrhizal fungus that helps in phosphorus absorption,

∴ the symbiotic nitrogen fixer is Frankia.

Answer: (2)

AIPMT 2009

Keep practising — Microbes in Human Welfare

2

Which one of the following pairs is wrongly matched?

  1. Detergents – lipase
  2. Fruit juice – pectinase
  3. Alcohol – nitrogenase
  4. Textile – amylase
AIPMT 2009
3

Which of the following is not used as a biopesticide?

  1. Bacillus thuringiensis
  2. Trichoderma harzianum
  3. Nuclear Polyhedrosis Virus (NPV)
  4. Xanthomonas campestris
AIPMT 2009
4

The bacterium Bacillus thuringiensis is widely used in contemporary biology as -

  1. Indicator of water pollution
  2. Agent for production of dairy products
  3. Source of industrial enzyme
  4. Insecticide
AIPMT 2009
5

Modern detergents contain enzyme preparations of

  1. thermoacidophiles
  2. thermophiles
  3. acidophiles
  4. alkaliphiles
AIPMT 2008
6

Trichoderma harzianum has proved a useful microorganism for:

  1. biological control of soil-borne plant pathogens
  2. reclamation of wastelands
  3. gene transfer in higher plants
  4. bioremediation of contaminated soils
AIPMT 2008
7

Which one of the following proved effective for biological control of nematodal disease in plants?

  1. Pisolithus tinctorius
  2. Paecilomyces lilacinus
  3. Pseudomonas cepacia
  4. Gliocladium virens
AIPMT 2008
8

Probiotics are-

  1. Cancer inducing microbes
  2. New kind of food allergens
  3. Live microbial food supplement
  4. Safe antibiotics
AIPMT 2007
9

Which one of the following pairs is wrongly matched ?

  1. Methanogens – Gobar gas
  2. Yeast – Ethanol
  3. Streptomycetes – Antibiotic
  4. Coliforms – Vinegar
AIPMT 2007
10

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
11

Curing of tea leaves is brought about by the activity of

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

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