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Biology Projects & Essays Reports
What is Green House Effect ?
The name "Green-house effect" comes from the fact that this effect is use in horticulture for the up bringing of green plant's in small house made of glass walls and glass root. The green walls and roofs of a green-house allows the sun-light to come in freely but it does not allows the long wavelength infrared radiations reflected by the soil, plants and other contents of green house to go out.
Role of Carbondioxide in Green House Effect  The carbon dioxide in the atmosphere also performs another major role. The earth receives light of different wavelengths from the sun. The Ozone in the upper atmosphere absorbs most of the harmful ultraviolet radiation and lets the other wavelengths pass through.

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Project Report on Drugs Addiction "DRUGS ADDICTION"
INTRODUCTION OF "DRUGS ADDICTION" Drug Addiction word is make by two words : 
(I) Drug (II) Addiction.

What is means Drug Any substance, other than food, used in the prevention, diagnosis, all aviation or treatment of a disease is called a drug. A drug may also be defined as a chemical which, when taken in some way after the body function. Drug is also known as a medicine. Generally, the term drugs applied to any stimulating or depressing substance that can be habituating or addictive.
Meaning of Addiction Addiction is the habitual, psychological and physiological dependence on a substance or practice. Which is beyond voluntary control. A person who is habituated to a substance or a practice, especially a harmful one, is called an addict.
Drugs Dependence Drugs are prescribed by physicians for the prevention or treatment of diseases, or for increasing the physical and mental performance and are withdrawn as soon as the desired effect is achieved. Repeated use of certain drugs on a periodic or continuous basis may make the body dependence. Such drugs are called psychotropic rugs. They act on the brain and alter behaviour, consciousness and capacity of perception. Hence, they are also termed mood-altering drugs. Some people start taking drugs without medical advise due to one reason or the other and become drugs dependent.
Classification of Drugs There are a large number of drugs on which people become dependent. These are classifies into four major groups : sedatives and tranquilizers, opiate narcotics, stimulants and hallucinogens.