Class XII

Sunken stomata is a characteristic feature of
  1. hydrophyte
  2. mesophyte
  3. xerophyte
  4. halophyte
Gas released in Bhopal gas tragedy was
  1. methyl isocyanate
  2. potassium isothiocyanate
  3. sodium isothiocyanate
  4. ethyl isothiocyanate
Fish die in water bodies polluted by sewage due to
  1. pathogens
  2. clogging of gills by silt
  3. reduction in oxygen
  4. fuel smell
The relation between algae and fungi in a lichen is
  1. symbiosis
  2. parasitism
  3. commensalism
  4. protocooperation
Which one of the following organism is used as indicator of water quality
  1. Beggiatoa
  2. Chlorella
  3. Azospirillum
  4. Escherichia
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