AIR AROUND US

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Across
  1. 3. When inhaled, diaphragm _______ and move downward.
  2. 5. Carbon dioxide does not affect moist red litmus paper because it is not _______.
  3. 6. Oxygen inhaled will dissolve at the surface of the _______ alveolus.
  4. 7. _________ is a process that occurs when a substance reacts with oxygen chemically, releasing energy and light.
  5. 8. Oxygen does _______ combustion.
  6. 12. Combustion only takes place in the presence of air (oxygen),______ and heat.
  7. 13. The glowing splinter ___________ when placed in test tube containing oxygen.
  8. 16. Oxygen will be absorbed into the blood capillaries through the thin ________ wall.
  9. 17. The lime water becomes _______ when places in test tube containing carbon dioxide.
  10. 19. The burning splinter ________ when places in test tube containing carbon dioxide.
  11. 20. Combustion of fuels produces energy which can be used to generate ______ energy at a power station.
Down
  1. 1. Mechanism by which our body get in the oxygen.
  2. 2. Oxygen is _________ in sodium hydroxide.
  3. 4. _________ is the process that the body uses to release energy from breakdown of nutrients.
  4. 5. The layer of air that surrounds the Earth’s surface is called the _______.
  5. 8. Oxygen and carbon dioxide are slightly _______ in water.
  6. 9. When exhaled, diaphragm ________ and move upward.
  7. 10. Mechanism by which our body get rid of carbon dioxide.
  8. 11. The more ________ the air, the more the water vapour is in the air.
  9. 14. Carbon dioxide produced by respiration is absorbed by green plants to conduct ______.
  10. 15. ________ is the mechanical process of inhaling and exhaling.
  11. 16. Carbon dioxide is _________ as they affects moist blue litmus paper.
  12. 18. With carbon dioxide, the hydrogen carbonate indicator change colour from red to _______.