Study Materials

NCERT Solutions for Class 6th Science

 

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Chapter 15. AIR AROUND US

Chapter Review

 

 

 

15. AIR AROUND US 


Chapter-reviews: 

  • The air contains nitrogen 79%, oxygen 21%, carbon dioxide 1%, some other gass, water vapour. Air also contains dust particles and smoke.  
  • Oxygen is the gas, which is  essential for respiration.
  • Air support burning.
  • Moving air is called wind.
  • Air occupies space. 
  • The presence of water vapour in air is important for the water cycle in nature.
  • The air contains water vapour.
  • The envelope of air that surrounds the earth is known as atmosphere.
  • Atmosphere is essential for life on earth.
  • Aquatic animals use dissolved air in water for respiration.
  • Plants and animals depend on each other for exchange of oxygen and carbon dioxide from air.
  • Nitrogen gas is present in atmosphere in large amount. 
  • Animals and plants both use oxygen for respiration and gaseous exchanges take place among themselves. 
  • Animals cannot live without plants. Similarly, plants can not survive for long without animals.
  • Windmills are also used to generate electricity. which run by the help of air. 
  • Air also helps in the dispersal of seeds and pollen of flowers of several plants.
  • Air plays an important role in water cycle.
     

 

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