Class VI

Respiration takes place at/in
  1. all of these
  2. night
  3. day time
  4. evening
In fish, respiration takes place through
  1. gills
  2. lungs
  3. throat
  4. tail
. To perform fractional distillation of air, it must be liquefied and then purified to remove
  1. dust
  2. molecule
  3. atom
  4. rust
Process of trapping some of heat from sun to maintain life on earth is known as
  1. equilibrium
  2. greenhouse effect
  3. none of them
  4. global warming
A thin layer that is held in place by gravity and provides us with oxygen is known as
  1. temperature
  2. season
  3. atmosphere
  4. weather
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