selection of indicator

With ordinary acid-base indicators the, colour change is not sharp and abrupt, but it extends over 2 units of pH. In order to have sharp colour change over a narrow and selected range of pH, a mixture of indicators are used. The pK I n d values of these indica..

Nutrition in grasshopper (Poecilocerus pictus) is holozoic and as the name indicates is a herbivore, feeding on different kinds of vegetation like the grasses, germinating grains, leafy vegetation, etc. Grasshopper - External Features It bites off pieces of vegetation and has to grind it ..

. Neo-Darwinism attempts to explain evolution in terms of genotypic variations, natural selection and isolation. The occurrence of organic evolution is established by the innumerable evidences that are available from the different branches of biology. The study of extinct organisms (palae..

Here, the monohalogen derivatives of alkanes are named as haloalkanes. While writing the names, the word 'halo' is prefixed to the name of the alkane corresponding to the longest continuous carbon chain holding the halogen atom. In case of branched chain alkanes, the following rules are followed: ..

Geological Distribution - The organisms show particular patterns of distribution on earth. The distribution of the species give an indication of how the earth was earlier. It is believed that the earth was a single mass called the Pangea. It consisted of two large continental masses calle..

>Weismann proposed the theory of continuity of germplasm, only the changes that affect the germ cells and the germplasm (the collection of genes) will be inherited by successive generations Darwin proposed the theory of natural selection to explain the 'survival of the fittest' to lead to..

When only one side chain is present: The carbon atoms in the selected parent chain are numbered as 1, 2, 3... from one end to the other. The numbering is done in such a way that the carbon atom carrying the side-chain is given the lowest possible number. For example,..

Ploidy Breeding - An organism, in which number of complete chromosome sets is more than the diploid number is called polyploid. It is usual practice to express the chromosome number of an organism in diploid, symbolically represented by 2n. In all sexually propagated crops, such expression is of sp..

Mechanical properties like strength, stiffness (Rigidity), ductility, malleability and brittleness have to be carefully studied to select a material for a particular job. The metallic parts of machines should not be subjected to stress beyond the elastic limit otherwise they will be de..