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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.
Four Distinct Phases of Demographic Transition Demographic transition takes place in four distinct phases. 1. Re-industrial stage in which harsh living conditions lead to
Water Pollutants - Water Pollution Water pollution can occur on account of any one or more of the following agents: 1. Biological: Pathogens such as virus, bacteria,
#types
Q. How to Prepare a Key? Let us prepare a key by making a choice of. characters, listing significant and insignificant characters, tabulating these characters and forming dicho
A "phosphodiester bond" links together: Answer the 3' hydroxyl group and the N9 atom of adenine in ATP. The Phosphate group and N9 atom of adenine in ATP. Sequential nucleosides in
Conventions for using binomial nomenclature The names of higher categories are often synthesized from Latin words in the same manner as generic or specific names, and always s
An interesting observation made by an American biologist H.C. Bumpus (1899) provides a good explanation for normalising selection. Bumpus collected some 136 injured house sparrows
CARBOHYDRATE METABOLISM The endproducts of carbohydrate digestion absorbed into the blood and taken to the liver by hepatic portal vein are four monosaccharide sugar ( C 6
Calculate the Level of Magnesium in urine? Urinary Mg excretion decreases with Mg deficiency. Therefore, Mg excretion before and after administration of an intravenous Mg load
describe the biting mechanism of a poisonous snake
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