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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.
Microbial polysaccharides Many microorganisms produce polysaccharides that either remain attached to the cell wall (capsular polysaccharides) or are secreted into the extracel
Eucaryotic cell structure All eucaryotic cells have a cytoskeleton made up of a network of protein filaments (Figure shown below). This network gives the cell its shape, capac
Define requirement of energy for Physical activity? This is the most variable and, after BMR, the second largest component of daily energy expenditure. Humans perform obligator
Define Briefly about the Copper? As early as the times of Hippocrates, copper compounds were used to treat various diseases. However, in the 20" century, it was noticed that an
Conservation of biodiversity is very important to maintain the ecological balance of ecosystem. Various steps for conservation of biodiversity: 1. Creation of consc
Hepatitis B Vaccination against hepatitis B (Engerix-B - GlaxoSmithKline; Recombivax HB - Merck) is now a routine pediatric immunization in the US. It is recommended for previo
TYPES OF PLASTIDS (1 ) LEUCOPLASTS These are present in ground parts of plants, internal parts of herbaceous stems and deep tissues of plants where sun light is not avail
what are the organs of respiration in lower forms of animals?
DISORDER S OF THE GONADS Hypogonadism. Inadequate gonadal function is called hypogonadism. It is due to defects in, or injury to the hypothalamus, the pituitary gland, of th
How does a plasma membrane regulate movement of molecules into and out of a cell?
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