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Microbes in Human Welfare · Question 52

AIPMT 2010 (Prelims)MCQMedium📈 Topic in 12% papers+4−1
1

The common nitrogen-fixer in paddy fields is –

  1. Azospirillum
  2. Frankia
  3. Rhizobium
  4. Oscillatoria

Answer

(1) Azospirillum

Solution

As per NCERT, free-living bacteria in the soil such as Azospirillum and Azotobacter fix atmospheric nitrogen and enrich the nitrogen content of the soil.

Azospirillum lives in close association with the roots of cereals such as rice, and is the common nitrogen-fixer used as a biofertiliser in paddy fields.

Frankia fixes nitrogen in root nodules of non-leguminous plants (e.g. Alnus), and Rhizobium in root nodules of leguminous plants.

Answer: (1)

AIPMT 2010 (Prelims)

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2

Which one of the following is not used in organic farming ?

  1. Earthworm
  2. Oscillatoria
  3. Snail
  4. Glomus
AIPMT 2010 (Prelims)
3

Which of the following is a symbiotic nitrogen fixer?

  1. Azotobacter
  2. Frankia
  3. Azolla
  4. Glomus
AIPMT 2009
4

Which one of the following pairs is wrongly matched?

  1. Detergents – lipase
  2. Fruit juice – pectinase
  3. Alcohol – nitrogenase
  4. Textile – amylase
AIPMT 2009
5

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
6

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
7

Modern detergents contain enzyme preparations of

  1. thermoacidophiles
  2. thermophiles
  3. acidophiles
  4. alkaliphiles
AIPMT 2008
8

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
9

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
10

Probiotics are-

  1. Cancer inducing microbes
  2. New kind of food allergens
  3. Live microbial food supplement
  4. Safe antibiotics
AIPMT 2007
11

Which one of the following pairs is wrongly matched ?

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

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