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Microbes in Human Welfare · Question 35

AIPMT 2012 (Prelims)MCQEasy📈 Topic in 0% papers+4−1
1

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

Answer

(1) Trichoderma sp. against certain plant pathogens

Solution

As per NCERT, Trichoderma species are free-living fungi, very common in root ecosystems, that are effective biocontrol agents of several plant pathogens.

Ladybird beetle (an insect, not a microbe) controls aphids (2) is not microbial control.

Nucleopolyhedroviruses (baculoviruses) attack insects and other arthropods, whereas white rust of Brassica is a fungal disease (3) is wrong.

Bt-cotton is a transgenic crop, not a biocontrol agent (4) is wrong.

Answer: (1)

AIPMT 2012 (Prelims)

Keep practising — Microbes in Human Welfare

2

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)
3

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)
4

Consider the following statements (A-D) about organic farming. Which of these statements are correct?

  1. (B) and (C) only
  2. (B), (C) and (D)
  3. (C) and (D) only
  4. (A) and (B) only
AIPMT 2011 (Mains)
5

Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are correct?

  1. Acetobacter aceti – acetic acid
  2. Clostridium butylicum – lactic acid
  3. Aspergillus niger – citric acid
  4. Yeast – statins
AIPMT 2011 (Mains)
6

The most common substrate used in distilleries for the production of ethanol is :

  1. Ground gram
  2. Molasses
  3. Soyabean
  4. Corn meal
AIPMT 2011 (Prelims)
7

Which one of the following is not a biofertilizer ?

  1. Agrobacterium
  2. Nostoc
  3. Rhizobium
  4. Mycorrhiza
AIPMT 2011 (Prelims)
8

Secondary sewage treatment is mainly a :

  1. Mechanical process
  2. Chemical process
  3. Biological process
  4. Physical process
AIPMT 2011 (Prelims)
9

Which of the following is mainly produced by the activity of anaerobic bacteria on sewage ?

  1. Propane
  2. Mustard gas
  3. Marsh gas
  4. Laughing gas
AIPMT 2011 (Prelims)
10

An organism used as a Biofertilizer for raising soyabean crop is :

  1. Azotobacter
  2. Azospirillum
  3. Nostoc
  4. Rhizobium
AIPMT 2011 (Prelims)
11

Ethanol is commercially produced through a particular species of :

  1. Clostridium
  2. Trichoderma
  3. Aspergillus
  4. Saccharomyces
AIPMT 2011 (Prelims)

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