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Environmental Issues · Question 78

AIPMT 2004MCQEasy📈 Topic in 12% papers+4−1
1

Common indicator organism of water pollution is :-

  1. Escherichia coli
  2. Lemna paucicostata
  3. Entamoeba histolytica
  4. Eichhornia crassipes

Answer

(1) Escherichia coli

Solution

Water polluted by sewage contains human faecal matter.

⇒ Escherichia coli is a normal inhabitant of the human large intestine and is passed out in very large numbers in faeces.

⇒ Its presence (coliform count) in water is therefore used as the common indicator of faecal / sewage pollution.

∵ Lemna and Eichhornia are aquatic weeds, and Entamoeba histolytica is a pathogen, not a routine indicator.

∴ The common indicator organism is Escherichia coli.

Answer: (1)

Out of syllabusAIPMT 2004

Keep practising — Environmental Issues

2

Fluoride pollution mainly affects :-

  1. Heart
  2. Kidney
  3. Brain
  4. Teeth
Out of syllabusAIPMT 2003
3

Escherichia coli is used as an indicator organism to determine pollution of water with :-

  1. Faecal matter
  2. Pollen of aquatic plants
  3. Heavy metals
  4. Industrial effluents
Out of syllabusAIPMT 2003
4

Which of the following is absent in polluted water?

  1. Larva of stone fly
  2. Hydrilla
  3. Blue-green algae
  4. Water hyacinth
Out of syllabusAIPMT 2002
5

Maximum greenhouse gas is released by which country?

  1. France
  2. Britain
  3. India
  4. U.S.A.
Out of syllabusAIPMT 2002
6

What is the intensity of sound in normal conversation?

  1. 30–60 dB
  2. 10–20 dB
  3. 120–150 dB
  4. 70–90 dB
Out of syllabusAIPMT 2001
7

Which is the cause of the damage expressed as relative biological effectiveness?

  1. Low temperature
  2. High temperature
  3. Radiation
  4. Pollution
Out of syllabusAIPMT 2000

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