{"id":24186,"date":"2021-06-10T16:58:51","date_gmt":"2021-06-10T11:28:51","guid":{"rendered":"https:\/\/ncertsolutions.guru\/?p=24186"},"modified":"2021-06-10T16:58:51","modified_gmt":"2021-06-10T11:28:51","slug":"ncert-solutions-for-class-6-science-chapter-15","status":"publish","type":"post","link":"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-6-science-chapter-15\/","title":{"rendered":"NCERT Solutions for Class 6 Science Chapter 15 Air Around Us"},"content":{"rendered":"

These NCERT Solutions for Class 6 Science<\/a> Chapter 15 Air Around Us Questions and Answers are prepared by our highly skilled subject experts to help students while preparing for their exams.<\/p>\n

Air Around Us NCERT Solutions for Class 6 Science Chapter 15<\/h2>\n

Class 6 Science Chapter 15 Air Around Us Textbook Exercise Questions and Answers<\/h3>\n

Question 1.
\nWhat is the composition of air?
\nAnswer:
\nAir is mixture of nitrogen, oxygen, carbon dioxide, water vapour and a few other gases. Some dust particles may also be present in it. Air is a mixture of gases, mainly containing nitrogen (about 78% by volume) and oxygen (about 21% by volume). The remaining 1% is made up gases, such as argon (about 0.9%), carbon dioxide (0.03%) and small amounts of other gases. Varying quantities of dust, smoke and water vapour are also present. The amount of these in the air varies from place to place and from time to time.<\/p>\n

Question 2.
\nWhich gas in the atmosphere is essential for respiration?
\nAnswer:
\nOxygen gas in the atmosphere is essential for respiration.<\/p>\n

Question 3.
\nHow will you show that air supports burning?
\nAnswer:
\nFix two burning candles of same size in the middle of two troughs. Fill the troughs with equal amounts of water. The water level should be below the height of candles. Light the candles and cover one of them with a bigger jar and the other one with a smaller jar. Observe carefully what happens to the burning candles and the water level. Note the time after which both the candles go off. You will observe that the candle covered with smaller glass jar extinguishes first and then the one covered with the bigger jar. Water level rises up in both the jars. This shows that air is required for buming\/combustion. Bigger glass jar had more air inside it, so the candle kept burning for a longer time. Oxygen in the jar is consumed due to burning. Hence, water level rises up to fill the empty space in the jar.
\n\"NCERT<\/p>\n

Question 4.
\nHow will you show that air is dissolved in water?
\nAnswer:
\nTake some water in a glass vessel or beaker. Heat it slowly on a tripod stand. Before the water begins to boil, look carefully at the inner surface of the vessel. You will see tiny bubbles on the inside. On heating, air dissolved in water escapes in the form of these bubbles. This shows that air is dissolved in water.
\n\"NCERT<\/p>\n

Question 5.
\nWhy does a lump of cotton wool shrink in water?
\nAnswer:
\nCotton lump contains air in it. There are various spaces in which air is filled. When cotton lump is put into water, air present in the vacant space dissolves in water and cotton lump shrinks.<\/p>\n

\"NCERT<\/p>\n

Question 6.
\nThe layer of air around the earth is known as ……………
\nAnswer:
\nAtmosphere.<\/p>\n

Question 7.
\nThe component of air used by green plants to make their food is …………….
\nAnswer:
\nCarbon dioxide.<\/p>\n

Question 8.
\nList five activities that are possible due to presence of air.
\nAnswer:
\nThe activities that are possible due to the presence of air are:<\/p>\n

    \n
  1. Rotation of windmills<\/li>\n
  2. Movement of sailing yachts<\/li>\n
  3. Flying of aeroplane, birds, etc.<\/li>\n
  4. Dispersal of seeds<\/li>\n
  5. Water cycle<\/li>\n<\/ol>\n

    Question 9.
    \nHow do plants and animals help each other in exchange of gases in the atmosphere?
    \nAnswer:
    \nAnimals and plants use oxygen from air during respiration and release carbon dioxide gas in air. But green plants release oxygen gas by using carbon dioxide during photosynthesis. Thus, we can say that animals and plants help each other in exchange of gases.<\/p>\n

    NCERT Extended Learning Activities And Projects<\/span><\/p>\n

    Question 1.
    \nOn a clear glass window facing towards an open area, fix a small rectangular strip of paper. Remove the strip after a few days. Do you notice a difference between the rectangular section that was left covered with paper and the rest of the glass window? By repeating this exercise every month, you can have an idea about the amount of dust present in air around you at different times of the year.
    \nHint:
    \nDo it yourself.<\/p>\n

    \"NCERT<\/p>\n

    Question 2.
    \nObserve the leaves of trees, shrubs or bushes planted by the roadside. Note whether their leaves have some dust or soot deposited over them. Take similar observations with the leaves of trees in the school compound or in a garden. Is there any difference in deposition of soot on leaves of trees near the roadside? What could be the possible reasons for this difference? Take a map of your city or town and try to identify regions in the map where you have noticed very thick layer of soot on the plants by the roadside. Compare with results obtained by other classmates and mark these areas on the map. Perhaps the results from all the students could be summarised and reported in newspapers.
    \nHint:
    \nDo it yourself.<\/p>\n

    Activity 1<\/span><\/p>\n

    Objective: To show the presence of air.
    \nMaterials required: Wind vane mounted on a stick.
    \nProcedure<\/p>\n