Short Notes on Air - What is Air?

Air:     Air is  very important for us, in which we breath for oxygen and survive. Air consists of about 21% oxygen, 0.04% Co2 and about 78% nitrogen. Environment pollution of air had lead to direct effect to human breath. The main Pollution of air are CO. CO2 hydrocarbon, and oxides of nitrogen and Sulphur. Automobiles are the greatest source of air pollution. ...

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Growth and Development In Plants

The permanent irreversible increase in size, weight, shape and structure is called growth. In  two lower plants growth occur in some entire body. In higher plants growth occur only in some regions called the growing plants. These growing points are called meristem. These regions consists of cells, which can divide and produce new cells. These div ding cells are called meristematic cell. The most important meristematic cell are found at the tips of stem and roots, are called apical meristem.These are responsible for the increase in the...

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Base Units of Physics - Meter, Kilogram, Second

Meter: It is the unit length. A meter is defined the distance between two marks  platinum - iridium bar kept 0 degree C in the international Bureau of weight and measures near Pairs.    The problem with metal standards of kind is they are liable to under go small changes in length as the years go. It was there fore decided in 1960 to choose a particular wavelength of light standardise a meter. Thus:    1 m=1650763.73 wavelength of krypton radiation.     The multiple and sub multiples units of a meter...

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