Air
Air A1. Nitrogen & Oxygen 2. Oxygen 3. Carbondioxide 4.Photosynthesis 5.Ozone 6.Polluted air B.1.True 2.True 3.False 4.False 5. True. C.1.(b) Nitrogen 2,(c) smoke 3.(c) Water Vapour. 4.(d) Carbon dioxide 5.(b) Acid rain. D1.Name the main components of air. Ans:The main components of air are nitrogen, oxygen, carbon dioxide &water vapour . D2.State the meaning of the term photosynthesis. Ans: Photo means light and synthesis means to combine. Photosynthesis is a process in which green plant prepare food by combining water and carbon dioxide in presence sunlight and chlorophyll is called photosynthesis. D3.State two possible harmful effects of ultraviolet rays. Ans: Two possible harmful effects of Ultraviolet ray are: i)Skin cancer in human being. ii)Damage to the eye lenses of human being . d4.Define the term Air Pollutants. Ans:The Impurities present in air and are harmful to...