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Microbes in Human Welfare · Question 57

AIPMT 2009MCQEasy📈 Topic in 0% papers+4−1
1

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

Answer

(4) Insecticide

Solution

As per NCERT, the bacterium Bacillus thuringiensis (Bt) is a microbial biocontrol agent used to control butterfly caterpillars.

Dried spores of Bt are mixed with water and sprayed on plants; the toxin released in the insect gut kills the larvae.

Bt is used as an insecticide (biopesticide), and Bt toxin genes are also used to make insect-resistant crops such as Bt cotton.

Answer: (4)

AIPMT 2009

Keep practising — Microbes in Human Welfare

2

Modern detergents contain enzyme preparations of

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

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
4

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
5

Probiotics are-

  1. Cancer inducing microbes
  2. New kind of food allergens
  3. Live microbial food supplement
  4. Safe antibiotics
AIPMT 2007
6

Which one of the following pairs is wrongly matched ?

  1. Methanogens – Gobar gas
  2. Yeast – Ethanol
  3. Streptomycetes – Antibiotic
  4. Coliforms – Vinegar
AIPMT 2007
7

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
8

Curing of tea leaves is brought about by the activity of

  1. fungi
  2. bacteria
  3. mycorrhiza
  4. viruses
AIPMT 2006
9

For retting of jute the fermenting microbe used is

  1. methanophilic bacteria
  2. butyric acid bacteria
  3. Helicobacter pylori
  4. Streptococcus lactis.
AIPMT 2005
10

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
11

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

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