Types of chemical reactions
Chemical reactions Chemical reactions are the processes in which new substances with new properties are formed. During a chemical reaction, atoms of one element do […]
Month: December 2017
How human beings came on earth?
Origin and evolution of man: Man is a mammals and supreme among all other animals which exist today. Central Asia is the place of origin […]
Differences between frog and toad
S.N. Frog Toad 1. Frog lives in or near water resources. Toad lives in dark, shady place in grass or under stones and leaves. 2. […]
Newton’s laws of motion
Sir Isaac Newton (1642-1727): Sir Isaac Newton, an English scientist, enunciated the basic laws of motion. He was born at Woolsthrope, Lincolnshire, England on the […]
Discovery of X-rays, electrons and the first liquid-fuelled rocket
Discovery of X-rays: German physicist Wilhelm Rontgen discovered X-rays in 1895 while he was investigating cathode rays (electrical discharges inside a tube containing very little […]
Some salient features of class Mammalia
Natural history: Mammals are primarily terrestrial vertebrates but few like whales and dolphins are aquatic. They are the most dominant animals on earth and have […]
Characteristic features of class Amphibia
Natural history: The amphibians (the vertebrates with dual life) were the first vertebrates to invade land, but they aren’t fully dependent to terrestrial life. They […]