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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.
Explain venous pulsation? Venous Pulsation: Normally the jugular venous pulsation faithfully reflects the pressure changes in right atrium. It is described as a, x, c, x, v, y,
How much physical activity is enough? Although it is difficult to prescribe the optimum amount of physical activity, it is important to note that any exercise programme has to
Q. How is the circulatory system of reptiles characterized? What is the basic difference between the amphibian and the reptile heart? The circulatory system of beings of the cl
Which of the following serves as a signal for the ribosome to begin translating the transcript? A. Addition of the poly a tail to the 3' end of the transcript B. Deamination
State the term in broad - Lunule. In sand dollars, notches or holes which pass through the body of the animal. Their function is not fully understood though may be involved in
Chromosomes, coloured bodies, are composed of proteins and DNA; so are chromatids. At metaphase I there are 46 chromosomesaligned in pairs along the human cells equatorial plate. A
Q. Define Dissection of the Aorta ? The CXR may be abnormal in upto 80 per cent of patients. The abnormalities include: i) Widened mediastinum: This is defined as a mediast
Determine some Methods of Blood Glucose Estimation? The various types of methods for estimation of blood glucose can be grouped under two groups: a) Chemical methods b) E
Importance of fat synthesis and storage : As is clear from above account, all surplus nutrients, digested and absorbed from above the immediate need of body, are readily
A restriction enzyme or restriction endonuclease is an enzyme which cuts DNA at particular recognition nucleotide sequences with Type II restriction enzymes cutting double-stranded
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