new school reform

Production of aromatic hydrocarbons (arenes) like benzene, toluene and xylenes. Earlier the bulk of arenes were obtained from coal tar, but now they are derived from petroleum by the process of reforming. Increasing the octane number of straight-run gasoline by increasing the proport..

Lamarck suggested that new needs arise in the organisms as the ever-changing environment influences them. Changes in the environment create a new need in the organism for adapting to that change, failing which the organism cannot surviv..

Intentional or chance introduction of exotic species into new islands or countries by man adversely affects the native species. Example: Rabbits and goats introduced in Pacific and Indian ocean islands are destroying the habitats of many native plants, reptiles and bir..

A species is a group of similar organisms, which can breed among themselves producing fertile offsprings. The members of a species not only share a common gene pool, but also share a common ancestry. Origin of a new species from the existing one, is called speciation. It is an important a..

While arranging the elements, in increasing order of atomic mass, Mendeleev left three blanks for elements that were not discovered at that time. He was able to predict the properties of these unknown elements more or less accurately. He named them eka-boron, eka-aluminium and eka-silicon. He name..

It is snowing in New York. What could be the likely temperature? => 22°F or 0°F or - 10°F or 38°F..

Proliferation of new cells from the surface of wound to reform the severed body parts..

The population of New York is _______ the population of Los Angeles in the year 1980. => equal to or less than or more than or five times..

In which year is the difference between the populations of New York and Los Angeles the largest? => 1990 or 1970 or 2000 or 1980..

Choose a reasonable measure for the land area of New York city. => 300 square miles or 300 square yards or 300 square feet or 300 square inches...