Sewage has heavy metals

  1. Elements with density greater than 5g /cm3
  2. Elements with density greater than 10g /cm3
  3. Elements with density greater than 15g /cm3
  4. Substances with density greater than 0.3g/cm3

Concept Questions :-

Water Pollution: I
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Increase in the concentration of the toxicant at successive trophic levels is called

  1. Biopiracy
  2. Biomagnification
  3. Biomanagement
  4. Biosystematics
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Biomagnification is a well known phenomenon for

  1. Mercury
  2. DDT
  3. Silver
  4. Both A and B
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Concentration of DDT in water is 0.003 ppb, what can be the most commonly seen concentration of DDT in zooplankton?

  1. 4 ppb
  2. 5 ppm
  3. 0.04 ppm
  4. 2 ppm
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Biomagnification of DDT in a fish eating bird can reach to

  1. 20 ppm
  2. 20 ppb
  3. 25 ppb
  4. 25 ppm
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Why does biological magnification happen?

  1. The toxic substances can be digested but are not metabolised by our body
  2. The toxic substances can neither by digested nor be metabolised and just pass on to the next generation
  3. The toxic substances causes genetic mutation that pass to next generation
  4. Both B and C

Concept Questions :-

Water Pollution: I
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High concentration of DDT directly disturbs

  1. Calcium Metabolism in birds
  2. Thinning of eggshell
  3. Premature breaking of eggshell
  4. Decline in bird population
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The natural aging of a lake by nutrient enrichment of its water is called

  1. Biomagnification
  2. Eutrophication
  3. Biopiracy
  4. Biosystematics
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when lake is young, the water is

  1. Cold and clear
  2. Warm and turbid
  3. Cold and turbid
  4. Warm and clear
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Streams draining into the lake and introduce nutrients such as ………

(Young lake)

  1. Nitrogen and Phosphorus
  2. DDT and cadmium
  3. DDT
  4. Calcium
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