Class XII

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
Desert plants are generally
  1. viviparous
  2. succulent
  3. herbaceous
  4. heterophyllus
The relation between algae and fungi in a lichen is
  1. symbiosis
  2. parasitism
  3. commensalism
  4. protocooperation
Sunken stomata is a characteristic feature of
  1. hydrophyte
  2. mesophyte
  3. xerophyte
  4. halophyte
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