Class XII

Major aerosol pollutant in jet plane emission is
  1. Sulphur dioxide
  2. carbon monoxide
  3. methane
  4. chlorofluoro-carbons
Drawback of DDT as pesticide is
  1. it becomes ineffective after some time
  2. it is less effective than others
  3. it is not easily/ rapidly degraded in nature
  4. its high cost
Which one of the following organism is used as indicator of water quality
  1. Beggiatoa
  2. Chlorella
  3. Azospirillum
  4. Escherichia
Green-house effect is warming due to
  1. infra-red rays reaching the earth
  2. moisture layer in atmosphere
  3. increase in temperature due to increase in carbon dioxide concentration of atmosphere
  4. ozone layer of atmosphere
Sunken stomata is a characteristic feature of
  1. hydrophyte
  2. mesophyte
  3. xerophyte
  4. halophyte
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