Notes and Study material for Exams
Mesolithic Period- Food producers The period of the earth’s history called the Stone Age was filled with remarkable achievements, made by early humans who roamed the globe following large animals around for food and for clothing. These early nomadic humans called hunter-gatherers needed tools and weapons that would be strong enough to take down animals … Read more
Structure and Design of Biosphere Reserves: A Framework for Conservation and Sustainable Development Biosphere reserves, designated by UNESCO’s Man and the Biosphere (MAB) Programme, are unique areas that strive to reconcile conservation of biodiversity with sustainable use of natural resources. They serve as living laboratories for testing and demonstrating integrated approaches to conservation and development. … Read more
The Biosphere Reserve: A Framework for Sustainable Development The concept of a Biosphere Reserve, a unique and innovative approach to conservation, emerged in the 1970s under the auspices of UNESCO’s Man and the Biosphere (MAB) Programme. This framework aims to reconcile the conservation of biodiversity with the sustainable use of natural resources, promoting harmonious interactions … Read more
Environmental influences are important both at the prenatal and postnatal stages of Human Development. At the prenatal stage, when a fetus is in the mother’s womb, internal or external harmful agents, such as certain legal or illegal drugs, alcohol, lead and pollutants can harm the unborn baby’s development. The mother’s Nutrition, diseases and emotional Stress … Read more
The Rate of a Chemical Reaction The rate of a chemical reaction can be defined as the amount of the reaction which occurs in unit time. The rate of a reaction is measured by choosing certain properties of the reaction which will indicate how far the reaction has gone, and whose magnitude can be observed … Read more
Proto-historic period Proto-historic period is the age nearest to the historical period. In so far as India is concerned the civilisation of the Vedic period is the proto-historic period. The hymns composed by the Vedic priests had perfected a poetic technique. These hymns were praise of their gods and were sung at sacrifices. These were … Read more
The Rate of a Chemical Reaction The rate of a chemical reaction can be defined as the amount of the reaction which occurs in unit time. The rate of a reaction is measured by choosing certain properties of the reaction which will indicate how far the reaction has gone, and whose … Read more
Chemical kinetics Chemical kinetics is that branch of chemistry which deals with the study of the speeds or the rates of chemical reactions, the factors affecting the rates of the reactions and the mechanism by which the reactions proceed. It concerns itself with the measurement of rates of reactions proceeding under the given conditions of … Read more
Slow reactions Chemical reactions that occur very slowly and can take a long time for completion are called slow reactions. Usually covalent compounds are involved in slow reactions.Some reactions can take days, weeks and months to complete; they are called very slow reactions.For example, Milk may take several hours or a day to convert to curd, while it … Read more
Metal In chemistry, a metal is an element that readily forms positive ions (cations) and has metallic Bonds. Metals are sometimes described as a lattice of positive ions surrounded by a cloud of delocalized electrons. The metals are one of the three groups of Elements as distinguished by their ionization and bonding properties, along … Read more