family life network

Purpose of reproduction leads to the formation of groups of individuals, called a family, which is an instinct of individuals of different sexes of a species. However, grouping behaviour varies from one species to another. i) Some animals are solitary and lead more an independent li..

Chromosomes (chroma = colour, soma = body) are tiny thread-like structures found in the nucleus of a cell. In a non-dividing cell they appear as a chromatin network while during cell division they become condensed to form short and thick chromosomes. Chromosomes are unique cell stru..

Astatine the last member of halogen family is a radioactive element with a very short life. All other halogens are abundant in nature in the combined state. The very high electronegativities of halogens make them very reactive and hence, they are not found in free stat..

At each pole, the gathering chromosomes become less distinct as they merge into a network The nucleolus reappears at each pole. A newly formed nuclear membrane encloses the chromatin network. Thus two daughter nuclei are formed. The number of chromosomes in each daughter nucleus..

Oxygen, sulphur, selenium, tellurium and polonium constitute the group 16 of the periodic table of elements. The first four elements are collectively called CHALCOGENS. The name derives from the Greek word for bronze and points to the association of sulphur and its congeners with copper. All these ..

Group 16 Elements (Chalcogens) - Introduction - Oxygen, sulphur, selenium, tellurium and polonium constitute the group 16 of the periodic table of elements. The first four elements are collectively called CHALCOGENS. The name derives from the Greek word for bronze and points to the association of s..

Polymers are macro-sized molecules of relatively high molecular mass, which find extensive use in our daily life. Polymers are large but single chain-like molecules in which the repeating unit derived from small molecules called monomers are covalently linked. Structurally, they are chara..

Introduction - Polymers are macro-sized molecules of relatively high molecular mass, which find extensive use in our daily life. Polymers are large but single chain-like molecules in which the repeating unit derived from small molecules called monomers are covalently linked. Structurally,..

) The species and ecosystems should not be exploited beyond their productive capacities. f) International trade in wild plants and animals and their products should be regulated by law. i) Protected areas should be set up to preserve the habitats of migratory animals, exploitation of the species al..

Introduction - Born in San Francisco, Frost spent most of his adult life in rural New England and his laconic language and emphasis on individualism in his poetry reflect this region. He attended Dartmouth and Harvard but never earned a degree, and as a young man with a growing famil..