D. Answer the following questions in brief.
1. Name the main components of air.
2. State the meaning of the term 'Photosynthesis'.
3. State two possible harmful effects of ultraviolet rays.
4. Define the term 'Air pollutant'.
5. Name any two of the gaseous pollutants present in air.
6. List any four causes of air pollution.
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1. The air in the atmosphere consists of nitrogen, oxygen, which is the life-sustaining substance for animals and humans, carbon dioxide, water vapour and small amounts of other elements (argon, neon, etc.). Higher in the atmosphere air also contains ozone, helium and hydrogen.
2. synthesis of chemical compounds with the aid of radiant energy and especially light especially : formation of carbohydrates from carbon dioxide and a source of hydrogen (such as water) in the chlorophyll-containing cells (as of green plants) exposed to light.
3.Health Effects of UV Radiation
(1) Skin cancer (melanoma and nonmelanoma)
(2) Premature aging and other skin damage.
(3) Cataracts and other eye damage.
(4) Immune system suppression.
4.Air pollutants are airborne substances (either solids, liquids, or gases) that occur in concentrations high enough to threaten the health of people and animals, to harm vegetation and structures, or to toxify a given environment.
5. The gaseous criteria air pollutants of primary concern in urban settings include sulfur dioxide, nitrogen dioxide, and carbon monoxide; these are emitted directly into the air from fossil fuels such as fuel oil, gasoline, and natural gas that are burned in power plants, automobiles, and other combustion sources.
6.Various Causes of Air pollution
Various Causes of Air pollutionThe Burning of Fossil Fuels. ...
- Various Causes of Air pollutionThe Burning of Fossil Fuels. ...Agricultural Activities. ...
- Various Causes of Air pollutionThe Burning of Fossil Fuels. ...Agricultural Activities. ...Waste in Landfills. ...
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