Air Model Question Paper

6th Standard

    Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 40
    3 x 1 = 3
  1. ____________ is the percentage of nitrogen in air.

    (a)

    78%

    (b)

    21%

    (c)

    0.03%

    (d)

    1%

  2. Gas exchange takes place in plants using __________

    (a)

    Stomata

    (b)

    Chlorophyll

    (c)

    Leaves

    (d)

    Flowers

  3. Nitrogen is used in the food packaging industry because it ________________

    (a)

    provides colour to the food

    (b)

    provides oxygen to the food

    (c)

    adds proteins and minerals to the food

    (d)

    keeps the food fresh

  4. 4 x 1 = 4
  5. __________ is the active component of air.

    ()

    Oxygen

  6. The gas given out during photosynthesis is _________.

    ()

    Oxygen

  7. __________ can be seen moving in a beam of sunlight in a dark room.

    ()

    Dust particles

  8. ________ gas turns lime water milky.  

    ()

    Carbon-di-oxide

  9. 5 x 1 = 5
  10. Inhaled air contains a large amount of carbon-di-oxide.

    (a) True
    (b) False
  11. Planting trees help in decreasing global warming.

    (a) True
    (b) False
  12. The composition of air is always exactly the same.

    (a) True
    (b) False
  13. Whales come up to the water surface to breathe in oxygen.

    (a) True
    (b) False
  14. The balance of oxygen in atmosphere is maintained through photosynthesis in animals and respiration in plants.

    (a) True
    (b) False
  15. 5 x 1 = 5
  16. Moving Air

  17. (1)

    Combustion

  18. Layer in which we live

  19. (2)

    Troposphere

  20. Stratosphere

  21. (3)

    Ozone layer

  22. Oxygen

  23. (4)

    Wind

  24. carbon-di-oxide

  25. (5)

    Photosynthesis

    2 x 2 = 4
  26. Photosynthesis : _____ :: Respiration : Oxygen.

  27. 78% of air : Does not support combustion :: _____ : Supports combustion.

  28. 3 x 2 = 6
  29. What is atmosphere? Name the five layers of atmosphere

  30. How do the roots of land plants get oxygen for breathing?

  31. What will happen if you breathe through mouth?

  32. 1 x 3 = 3
  33. Why do traffic assistants wear a mask on duty?

  34. 2 x 5 = 10
  35. How do plants and animals maintain the balance of oxygen and carbon-dioxide in air?

  36. Why is atmosphere essential for life on earth?

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