Introduction Nucleus is usually the most conspicuous organelle of eukaryotic cell. However, well defined nucleus is absent in prokaryotic cells. Nucleus is the repository of genome and the source of informational macromolecules that govern the synthetic activities of the cytoplasm. Discovery A Dutch Microscopist, Antonie van Leeuwenhoek observed nucleus in …

Nomenclature, in biological classification, system of naming organisms. The species to which the organism belongs is indicated by two words, the genus and species names, which are Latinized words derived from various sources. This system, which is called the Linnaean system of binomial nomenclature, was established in the 1750s by Carolus Linnaeus. Subsequent to the work of Linnaeus, a …

Unlike other living beings plants are immobile. They have to live at the mercy of nature. If the place they are standing on has a scarcity of water or minerals, they can’t move to a better place. If a tornado or cyclone arrives they can’t escape from it and take …