generating combinations

1. Carbon monoxide is used as a fuel by itself, or in the form of producer gas (mixture of carbon monoxide and nitrogen), or water gas (mixture of carbon monoxide and hydrogen). It is also present in fuel gases like coal gas. 2. It is used as a reducing agent in the extraction of metals. Carbon mon..

The plants developing from callus have shown large variations in their characters. Such variations are called somaclonal variations. Such variations occur as a part of mutation or as a part of clonal development. As these variations are not due to heredity, their transmissions to next generati..

Crop improvement by deliberate attempt to cross two parents of desirable characters to incorporate such characters in next generations is called breeding. The entire process of pollination, fertilization and regeneration is kept under control and selected parents are allowed to reproduce ..

Combustion is a chemical reaction in which burning of substances takes place. In this process, a substance combines with oxygen to burn (decompose) itself liberating heat and sometimes light and flame. Thus, combustion reactions are exothermic or heat dissipating reactions. Burning or com..

Breeding - Crop improvement by deliberate attempt to cross two parents of desirable characters to incorporate such characters in next generations is called breeding. The entire process of pollination, fertilization and regeneration is kept under control and selected parents are allowed to..

Applications of Doppler Effect - The Doppler effect provides a convenient means of tracking a satellite that is emitting a radio signal of constant frequency. The frequency of the signal received on the Earth changes as the satellite is passing. If the received signal is combined with a c..

. Use of commercial hybrids invariably involves inbred plants as parents -which means parental purity is maintained by not allowing pollen from other varieties to fertilize. The success of hybrid crop and its heterosis is much dependent on purity of parents. As against this, hybridization is common..

(the collection of genes) will be inherited by successive generations. Darwin proposed the theory of natural selection. According to this theory, the reproduction in large numbers resulted in a struggle for existence and competition. This leads to survival of the fittest. Thus the best of..

Hydrogen combines with non-metals like carbon, silicon, etc. to from covalent compound like halogens. Examples: CH 4 and CCl 4 . Remember : In 1766, Henry Cavendish, an English chemist, discovered hydrogen, by treating iron with dilute sulphuric acid. He also proved that when hydro..

. The darkness of skin colour is proportionate to the sum of the dominant genes present. A very dark person, will have all the six dominant genes (AA, BB and CC). A person with very light skin colour has all the six recessive genes (aa, bb, cc). When a man with a homozygous condition for dark skin ..