NCERT solution for class 6 || Science || Chapter 15

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NCERT solution for class 6 || Science || Chapter 15

15 Air around us 

Q1. What is the composition of air ? 

Answer - Air is mixture of 78% of nitrogen 21% of Oxygen and 0.03% of carbon dioxide dust particles and other gases

Q2. Which gas  in the atmosphere is essential for respiration ? 

Answer - Oxygen gas is essential for respiration

Q3. How will you prove that air supports burning 

Answer -  

  • Take a burning candle 
  • Place it in a water filled container   
  • Put an inverted glass on that candle 
  • The candle blow off after sometime 
  • And the water lavel inside the glass rises up   
  • The components of the oxygen burns up 
  • Show the empty place of the oxygen is occupied by water 
  •  It Prove that oxygen is necessary for burning 

Q4. How will you show that air is dissolved in water ? 

Answer - To show the air is dissolved in water we have to take a water in a container and heat it 

Before boiling of the water the small bubbles are arises on the walls of the container as these are due to the air present in water 

Q5. Why does a lump of cotton wool shrink in water ? 

Answer - A lump of cotton and wool shrinks in water because when it put in water the air present between wool and cotton will escape And it become shrink in water 

Q6. The layer of air around the earth is known -----.

Answer - Atmosphere

Q7. The component of air used by green plants to make their food is ---- 

Answer - Carbon dioxide

Q8. List five activities that are possible due to the presence of air ? 

Answer -  

a) Photosynthesis 

b) Burning  

c ) Respiration 

d) Movement of clouds 

e ) Moment of windmill for the generation of electricity 

Q9. How do plants and animals help each other in the exchange of gases in the atmosphere? 

Answer -  Plants take that carbon dioxide from the atmosphere for the process of photosynthesis and release oxygen by same process while human and other animals take the oxygen for respiration and  exhale the carbon dioxide in this way they both the help to each other by the exchange of gases in the atmosphere


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