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Pollution - Environmental Pollution
Pollution refers to any undesirable change in the physical, chemical or biological characteristics of our environment, i.e. air, water and oil that may or will adversely affect humans or other species and life support systems of our biosphere directly or indirectly. A substance whose introduction into a resource damages the latter's usefulness is called a pollutant. Pollutants are grouped into two broad categories:
The non-biodegradable pollutants such as heavy metals, pesticides, move through the food chain and may get magnified to dangerous levels in higher trophic level organisms. Some of these combine with other compounds and produce toxic substances. However, biodegradable materials such as human and animal wastes, agro-based residues and fertilisers can also pose a threat if their quantities or inputs exceed the Assimilative capacity of the environment.
Q Lower Oesophageal Sphincter? Competency of LES (Lower Oesophageal Sphincter) is important. The pressure of this sphincter is controlled by many factors, one of which is hormo
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Explain the Food Irradiation - method of food preservation? Food irradiation is another sterilizing technique in which the foods are bombarded by high-energy rays called gamma
Oxides of nitrogen: These include nitrogen monoxide (NO) and nitrogen dioxide (NO2). NO is a colourless, odourless and inert gas but like CO it can also combine with
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Suppose you were presented with two 40X lenses to use on your microscope, lens A had a numerical aperture of 0.56 and lens B had a numerical aperture of 0.75. Which is best and why
Open Mitral Valvotomy : Technique: A median stemotomy is done; peri cardium opened and stay sutures taken. After heparinisation ascending aorta is cannulated and then SVC
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