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Environmental Issues · Question 61

AIPMT 2009MCQEasy📈 Topic in 12% papers+4−1
1

DDT residues are rapidly passed through food chain causing biomagnification because DDT is :

  1. Moderately toxic
  2. Water soluble
  3. Non-toxic to aquatic animals
  4. Lipo soluble

Answer

(4) Lipo soluble

Solution

As per NCERT, biomagnification is the increase in concentration of a toxicant at successive trophic levels.

∵ DDT is lipid (fat) soluble and cannot be metabolised or excreted by organisms,

∴ it accumulates in the fatty tissues and is passed on to the next trophic level, its concentration increasing at each level.

Answer: (4)

Out of syllabusAIPMT 2009

Keep practising — Environmental Issues

2

Chipko movement was launched for the protection of -

  1. Forests
  2. Livestock
  3. Wet lands
  4. Grasslands
Out of syllabusAIPMT 2009
3

A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this: (i) Lots of urea and phosphate fertilizer were used in the crops in the vicinity (ii) The area was sprayed with DDT by an aircraft (iii) The lake water turned green and stinky (iv) Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis Which two of the above were the main causes of fish mortality in the lake?

  1. (i), (ii)
  2. (iii), (iv)
  3. (i), (iii)
  4. (ii), (iii)
Out of syllabusAIPMT 2008
4

According to Central Pollution Control Board (CPCB), which particulate size in diameter (in micrometers) of the air pollutants is responsible for greatest harm to human health?

  1. 2.5 or less
  2. 1.5 or less
  3. 1.0 or less
  4. 5.2–2.5
Out of syllabusAIPMT 2008
5

Which one of the following is the correct percentage of the two (out of the total of 4) greenhouse gases that contribute to the total global warming?

  1. CFCs 14%, Methane 20%
  2. CO2 40%, CFCs 30%
  3. N2O 6%, CO2 86%
  4. Methane 20%, N2O 18%
Out of syllabusAIPMT 2008
6

In which one of the following the BOD (Biochemical Oxygen Demand) of sewage (S), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been arranged in ascending order?

  1. SE < PE < S < DE
  2. SE < S < PE < DE
  3. PE < S < SE < DE
  4. S < DE < PE < SE
Out of syllabusAIPMT 2007
7

In a coal fired power plant electrostatic precipitators are installed to control emission of:-

  1. SPM
  2. SO2
  3. CO
  4. NOx
Out of syllabusAIPMT 2007
8

Which one of the following is not a bioindicator of water pollution?

  1. Blood-worms
  2. Stone flies
  3. Sewage fungus
  4. Sludge-worms
Out of syllabusAIPMT 2007
9

Limit of BOD prescribed by Central Pollution Control Board for the discharge of industrial and municipal waste waters into natural surface waters, is -

  1. <30 ppm
  2. <3.0 ppm
  3. <100 ppm
  4. <10 ppm
Out of syllabusAIPMT 2006
10

Photochemical smog pollution does not contain-

  1. Nitrogen dioxide
  2. PAN (peroxy acyl nitrate)
  3. Ozone
  4. Carbon dioxide
Out of syllabusAIPMT 2006
11

Montreal Protocol which calls for appropriate action to protect the ozone layer from human activities was passed in the year-

  1. 1988
  2. 1986
  3. 1985
  4. 1987
Out of syllabusAIPMT 2006

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