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Environmental Issues · Question 45

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

In an area where DDT had been used extensively, the population of birds declined significantly because :

  1. Earthworms in the area got eradicated
  2. Cobras were feeding exclusively on birds
  3. Birds stopped laying eggs
  4. Many of the birds' eggs laid did not hatch

Answer

(4) Many of the birds' eggs laid did not hatch

Solution

DDT is a non-biodegradable pesticide that undergoes biomagnification and reaches high concentration in fish-eating birds.

As per NCERT, high concentration of DDT disturbs calcium metabolism in birds, which causes thinning of the eggshell and premature breaking of eggs, eventually causing a decline in bird populations.

Many of the eggs laid did not hatch.

Answer: (4)

Out of syllabusAIPMT 2012 (Prelims)

Keep practising — Environmental Issues

2

Which one of the following is a wrong statement?

  1. Most of the forests have been lost in tropical areas
  2. Greenhouse effect is a natural phenomenon
  3. Ozone in upper part of atmosphere is harmful to animals
  4. Eutrophication is a natural phenomenon in freshwater bodies
Out of syllabusAIPMT 2012 (Prelims)
3

Measuring biochemical oxygen demand (BOD) is a method used for

  1. Working out the efficiency of oil driven automobile engines
  2. Estimating the amount of organic matter in sewage water
  3. Measuring the activity of Saccharomyces cerevisiae in producing curd on a commercial scale
  4. Working out the efficiency of R.B.Cs. about their capacity to carry oxygen
Out of syllabusAIPMT 2012 (Prelims)
4

"Good ozone" is found in the

  1. Troposphere
  2. Ionosphere
  3. Stratosphere
  4. Mesosphere
Out of syllabusAIPMT 2011 (Mains)
5

Eutrophication is often seen in :

  1. Ocean
  2. Mountains
  3. Deserts
  4. Fresh water lakes
Out of syllabusAIPMT 2011 (Prelims)
6

Which one of the following pairs of gases is the major cause of "greenhouse effect"?

  1. CFCs and SO2
  2. CO2 and CO
  3. CO2 and N2O
  4. CO2 and O3
Out of syllabusAIPMT 2011 (Prelims)
7

Which one of the following statements is wrong in case of Bhopal tragedy?

  1. Thousands of human beings died
  2. It took place in the night of December 2/3, 1984
  3. Radioactive fallout engulfed Bhopal
  4. Methyl isocyanate gas leakage took place
Out of syllabusAIPMT 2011 (Prelims)
8

Which one of the following is the correct expanded form of the given acronym?

  1. IPCC = International Panel for Climate Change
  2. EPA = Environmental Pollution Agency
  3. UNEP = United Nations Environmental policy
  4. IUCN = International Union for Conservation of Nature and Natural Resources
Out of syllabusAIPMT 2011 (Prelims)
9

When domestic sewage mixes with river water

  1. The river water is still suitable for drinking as impurities are only about 0.1%
  2. Small animals like rats will die after drinking river water
  3. The increased microbial activity releases micro-nutrients such as iron
  4. The increased microbial activity uses up dissolved oxygen
Out of syllabusAIPMT 2010 (Mains)
10

A renewable exhaustible natural resource is –

  1. Forest
  2. Minerals
  3. Coal
  4. Petroleum
Out of syllabusAIPMT 2010 (Prelims)
11

dB is a standard abbreviation used for the quantitative expression of –

  1. the dominant Bacillus in a culture
  2. the density of bacteria in a medium
  3. a certain pesticide
  4. a particular pollutant
Out of syllabusAIPMT 2010 (Prelims)

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