Class VI

Air is important on earth because it has necessary components essential for life of
  1. plants
  2. animals
  3. organism
  4. plants, animals and other organisms
Exhaled air contains 16% oxygen and about 4% of carbon dioxide, rest of 80% is
  1. neon
  2. argon
  3. nitrogen
  4. none of them
In fish, respiration takes place through
  1. gills
  2. lungs
  3. throat
  4. tail
Photosynthesis is a process in which carbon dioxide and water combine to form
  1. carbon
  2. calcium
  3. chlorophyll
  4. carbohydrates
Left over gas after process of combustion is generally
  1. oxygen
  2. argon
  3. nitrogen
  4. carbon dioxide
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