NCERT Extended Learning Activities And Projects<\/span><\/p>\nQuestion 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
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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>\nObjective: To show the presence of air.
\nMaterials required: Wind vane mounted on a stick.
\nProcedure<\/p>\n