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Microbes in Human Welfare · Question 46

AIPMT 2011 (Prelims)MCQMedium📈 Topic in 75% papers+4−1
1

Continuous addition of sugars in 'fed batch' fermentation is done to :

  1. obtain antibiotics
  2. produce methane
  3. purify enzymes
  4. degrade sewage

Answer

(1) obtain antibiotics

Solution

In fed-batch fermentation, sugar (substrate) is added continuously in small amounts during the run.

⇒ This keeps the microbes in a productive state for a longer time and avoids repression by excess sugar.

∴ It is used to increase the yield of secondary metabolites such as antibiotics (e.g., penicillin).

Answer: (1)

AIPMT 2011 (Prelims)

Keep practising — Microbes in Human Welfare

2

Organisms called Methanogens are most abundant in a :

  1. Polluted stream
  2. Hot spring
  3. Cattle yard
  4. Sulphur rock
AIPMT 2011 (Prelims)
3

Which one of the following helps in absorption of phosphorus from soil by plants?

  1. Glomus
  2. Rhizobium
  3. Frankia
  4. Anabaena
Out of syllabusAIPMT 2011 (Prelims)
4

An example of endomycorrhiza is -

  1. Nostoc
  2. Rhizobium
  3. Glomus
  4. Agaricus
AIPMT 2010 (Mains)
5

Select the correct statement from the following:

  1. Methanobacterium is an aerobic bacterium found in rumen of cattle
  2. Activated sludge-sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria
  3. Biogas, commonly called gobar gas, is pure methane
  4. Biogas is produced by the activity of aerobic bacteria on animal waste
AIPMT 2010 (Prelims)
6

A common biocontrol agent for the control of plant diseases is –

  1. Bacillus thuringiensis
  2. Trichoderma
  3. Glomus
  4. Baculovirus
AIPMT 2010 (Prelims)
7

The common nitrogen-fixer in paddy fields is –

  1. Azospirillum
  2. Frankia
  3. Rhizobium
  4. Oscillatoria
AIPMT 2010 (Prelims)
8

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

  1. Earthworm
  2. Oscillatoria
  3. Snail
  4. Glomus
AIPMT 2010 (Prelims)
9

Which of the following is a symbiotic nitrogen fixer?

  1. Azotobacter
  2. Frankia
  3. Azolla
  4. Glomus
AIPMT 2009
10

Which one of the following pairs is wrongly matched?

  1. Detergents – lipase
  2. Fruit juice – pectinase
  3. Alcohol – nitrogenase
  4. Textile – amylase
AIPMT 2009
11

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

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