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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.
Classification according to the modes of transmission 1. Direct zoonoses: The direct zoonoses are those zoonoses that are transmitted from an infected vertebrate host to a
Q. How Linnaeus classify the plant kingdom? Linnaeus classified the plant kingdom into 24 classes in his famous work 'Genera Plantarum' (1737) and 'Species Plantarum' (1753). I
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a) Mention the number of primers needed in each cycle of polymerase chain Reaction (PCR) . Write the role of primers and DNA polymerase in PCR. b) Give the characteristic fea
Complications of Phototherapy i) Insensible water loss: There is increased insensible water loss in infants undergoing phototherapy. ii) Gastrointestinal effects: Photot
GER M PLASM THEORY - It was proposed by Weismann. According to it, two types of cells are formed during embryonic development viz - Germ cell & Somatic cell. The germ ce
What are the parasympathetic neurons Patient A has a disease that has destroyed half of the alpha-adrenergic receptors on each of the smooth muscles that control the diameter o
Q. What is the first polar body? How different is it from the oocyte II? In oogenesis the oogonium differentiates into oocyte I (2n) and this cell enters meiosis and after fini
What type of larval dispersal does Dreissenids use?
what is the mode of nutrition in pisces
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