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Microbes in Human Welfare · Question 27

NEET 2013 (Karnataka)MCQEasy📈 Topic in 0% papers+4−1
1

Microbe used for biocontrol of pest butterfly caterpillars is :

  1. Streptococcus sp.
  2. Trichoderma sp.
  3. Saccharomyces cerevisiae
  4. Bacillus thuringiensis

Answer

(4) Bacillus thuringiensis

Solution

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

⇒ Spores of Bt are mixed with water and sprayed on vulnerable plants; they are eaten by the insect larvae, in whose gut the toxin is released and the larvae get killed, while other insects remain unharmed.

⇒ Trichoderma is a free-living fungus used against plant pathogens, and Saccharomyces cerevisiae is baker's/brewer's yeast.

Answer: (4)

NEET 2013 (Karnataka)

Keep practising — Microbes in Human Welfare

2

In gobar gas, the maximum amount is that of :

  1. Propane
  2. Butane
  3. Methane
  4. Carbon dioxide
AIPMT 2012 (Mains)
3

The domestic sewage in large cities :

  1. has very high amounts of suspended solids and dissolved salts
  2. has a high BOD as it contains both aerobic and anaerobic bacteria.
  3. is processed by aerobic and then anaerobic bacteria in the secondary treatment in Sewage Treatment Plant (STPs)
  4. When treated in STPs does not really require the aeration step as the sewage contains adequate oxygen
AIPMT 2012 (Mains)
4

Read the following four statements (A-D) : How many of the above statements are wrong ?

  1. Two
  2. One
  3. Four
  4. Three
AIPMT 2012 (Mains)
5

Which one of the following microbes forms symbiotic association with plants and helps them in their nutrition?

  1. Azotobacter
  2. Aspergillus
  3. Glomus
  4. Trichoderma
AIPMT 2012 (Prelims)
6

Monascus purpureus is a yeast used commercially in the production of:

  1. Ethanol
  2. Streptokinase for removing clots from the blood vessels
  3. Citric acid
  4. Blood cholesterol lowering statins
AIPMT 2012 (Prelims)
7

A patient brought to a hospital with myocardial infarction is normally immediately given

  1. Penicillin
  2. Streptokinase
  3. Cyclosporin A
  4. Statins
AIPMT 2012 (Prelims)
8

A nitrogen-fixing microbe associated with Azolla in rice fields is

  1. Tolypothrix
  2. Spirulina
  3. Frankia
  4. Anabaena
AIPMT 2012 (Prelims)
9

Which one of the following is an example of carrying out biological control of pests/diseases using microbes?

  1. Trichoderma sp. against certain plant pathogens
  2. Ladybird beetle against aphids in mustard
  3. Nucleopolyhedrovirus against white rust in Brassica
  4. Bt-cotton to increase cotton yield
AIPMT 2012 (Prelims)
10

Yeast is used in the production of

  1. Citric acid and lactic acid
  2. Lipase and pectinase
  3. Bread and beer
  4. Cheese and butter
AIPMT 2012 (Prelims)
11

Read the following statement having two blanks (A and B): “A drug used for (A) patients is obtained from a species of the organism (B) .” The one correct option for the two blanks is:

  1. A Organ-transplant, B Trichoderma
  2. A AIDS, B Pseudomonas
  3. A Swine flu, B Monascus
  4. A Heart, B Penicillium
AIPMT 2011 (Mains)

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