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Biology

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CBSE Gujarat Board Haryana Board

Previous Year Papers

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Class 10 Class 12

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

  • Sludge-worms

  • Blood-worms

  • Stone files

  • Sewage fungus


C.

Stone files

Stoneflies (e.g., Perla sp.) belong to order Plecoptera of class insecta which has the terrestrial mandibulates.

Stoneflies (e.g., Perla sp.) belong to order Plecoptera of class insecta which has the terrestrial mandibulates.

358 Views . 7 Shares

What is the term for the inflammation of cornea due to high absorption of UV-B radiation :
  • myopia
  • snow blindness
  • biomagnification
  • None of the above

B.

snow blindness
695 Views . 11 Shares

In the scrubber in the electrostatic precipitator the gases are passed through :
  • filter
  • lime
  • spray of water
  • both 2 and 3

D.

both 2 and 3
997 Views . 6 Shares

The meaning of BOD is :
  • Bacterial oxygen demand
  • Biological optimum density
  • Biochemical oxygen demand
  • Bioorganisation decay

C.

Biochemical oxygen demand
687 Views . 4 Shares

Ozone depletion will cause :
  • Forest fire
  • Pneumonia
  • Increased incidence of skin cancer
  • None of these

C.

Increased incidence of skin cancer
560 Views . 5 Shares

Which of the following pollutants is not produced by exhaust of motor vehicles ?
  • CO
  • Hydrocarbon
  • Fly-ash
  • NO

C.

Fly-ash
711 Views . 5 Shares

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