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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.
Counselling refers to professional guidance in resolving personal conflicts and emotional problems. Counselling is a process which enables a person to identify problems and find a
T ypes of hormones - (i) Releasing and Inhibitory hormones - Hormones of hypothalamus and kidney (renin) which control secretion of trophic hormones. (ii) Trophic hormon
Q. What do you mean by Pericardial effusion? Collection of fluid in the pericardial sac is known as Pericardial effusion. All cases of pericarditis can lead to pericardial effu
FRUIT AND VEGETABLE FACTORY BY-PRODUCTS India is emerging as a major producer of fruits and vegetables in the world. The country produced about 50 Mt of fruits and 90 Mt of veg
Q. Mistakes may happen during each copying process. The same is true for the DNA replication. Are there correction systems in cells that try to mend those mistakes? Under which sit
what is a vaso-constriction? what are the effects of vaso-constriction in the skin?
A healthy skeletal muscle fiber is isolated and has no external forces on it. It has normal intracellular levels of ATP and is bathed in physiological saline. Which of the follow
Liverworts and mosses are characterized by their lack of vascular conducting tissue. These two groups of liverwort, plants and mosses, are known by which of the below terms: a)
What is the significance of the epiglottis in human body? What happens to the glycogen concentration in the liver cells when the level of adrenaline enhances in the blood strea
Formation of Aqueous Humour It is universally accepted that the aqueous is produced by the ciliary processes. Although a great deal of research has been done on the fo
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