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It is defined as the presence of chemicals and particulate in the atmosphere in quantities and pollution that are harmful to human health and environment. It occurs when the concentration of certain substances become high enough to cause the atmospheric environment to become toxic. Air pollution affects the human being very high because every human being inhales about 15-22 kg of air daily and if it polluted it will damage human health considerably.
Example: SO2, CO, Chlorofluoro-Carbon (CFC'S), Nitrogen oxide etc.
Counter current flow - Respiration Each filament has an upper and a lower row of flat lamellae. The lamellae of successive filaments are in close contact. Gas exchange takes p
respiration & its types
Physical Weathering Mechanical forces acting upon the rocks cause physical weathering. Temperature fluctuations cause expansion and contraction of rock surface resulting in the
Tests of shelled amoebas are made from a variety of substances including sand grains, chitin and substrate, calcium salts, and even silica. These shells still accumulate in ocean d
Human Factor Theory - Accident Causation This theory of accident causation suggests that a chain of events caused by human error is the cause of accident. The chain of events
Tubercular Meningitis (TBM) Tubercular meningitis is a serious complication of childhood tuberculosis. It usually occurs secondarily to primary infection with tuburculosi
Protein of Animal Origin - Meat Meat: Skeletal or striated muscles are used for food purposes. Flesh of cattle, sheep and swine comprise most of the meat contents. Edible mea
Haem Group A group of compounds called porphyrins are widely distributed in plants, animals and bacteria. Porphyrins associate with metals to form metalloporphyrins which form
Radioactive Labelling Radioactive labelling method has been effectively applied on the chick blastoderm. The method includes labelling one embryo (donor) and grafting a part
Q What is the mass transportation across the cell membrane? Mass transportation is the exiting or the entrance of substances in or from the cell engulfed by portions of membran
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