General characteristic features of phylum Porifera
Poriferans (Pore bearing animals) are the first multicellular animals. They are commonly called sponges because of their appearance. They are aquatic, mostly marine, rarely fresh […]
Poriferans (Pore bearing animals) are the first multicellular animals. They are commonly called sponges because of their appearance. They are aquatic, mostly marine, rarely fresh […]
S.N. Ribonucleic acid (RNA) Deoxyribonucleic acid (DNA) 1. It contains ribose sugar. It contains deoxyribose sugar. 2. It lacks Thymine but has Uracil. It lacks […]
Clinical thermometer: Nineteenth- century doctors knew that a patient’s body temperature was a good guide to their health. Until British physician Thomas Allbutt invented the […]
S.N. Dicotyledonous stem Monocotyledonous stem 1. Internally, the stem is differentiated into epidermis, hypodermis, cortex, endodermis, pericycle, stelar system and pith. Internally, the stem is […]
Biology: The science which deals with the study of structure, organization, life processes, interactions, origin and evolution of living organisms is called biology. Aristotle is […]
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 […]
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 […]
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. […]
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: German physicist Wilhelm Rontgen discovered X-rays in 1895 while he was investigating cathode rays (electrical discharges inside a tube containing very little […]
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