Air around us Worksheet-6

Air around us Worksheet-6

 

True/False:

  1. Amphibians take in air with the help of tiny holes in their bodies called spiracles.
  2. Air is a mixture of several gases in which oxygen is about 22 % of air.
  3. Some aquatic animals such dolphins breathe with the help of lungs.
  4. Earthworm’s skin is moist with the help of a substance called mucous.
  5. 1 % of air is made of only water vapour, dust, and smoke.
  6. Carbon dioxide is given out as a by-product after respiration.
  7. Amphibians such as frogs breathe with the help of lungs, when on land.
  8. Oxygen is not needed for respiration.
  9. Birds breathe through lungs and air sacs that are open all the time.
  10. Pollution is the removal of substances in the environment.
  11. Excessive burning of fuels such as wood, coal, and petroleum, machines releasing gases are some causes of air pollution.
  12. There are only two processes in water cycle.
  13. Nitrogen is used up during burning.
  14. Recycling of plastics is one way of reducing air pollution.
  15. Air pollution causes severe diseases like asthma and cholera.

 

Answer Key:

  1. False
  2. False
  3. True
  4. True
  5. False
  6. True
  7. True
  8. False
  9. True
  10. False
  11. True
  12. False
  13. False
  14. True
  15. False