Its direct effects are physical or mechanical while indirect effects are physiological .
Wind modifies the humidity .
Dry winds diffuse dwarfing of plants .
Wind helps in pollination , dispersal of fruits and seeds and prevents frost damage .
Sometimes shrubs and trees are planted to protect the field against wind .
Such structures are known as wind breaks or shelter belt .
These plants are planted at 90degree to the wind velocity.
It affects both plants and animals in the following ways
1- Strong winds cause soil erosion so reducing soil fertility .
These also cause desertification by shifting of sand particles to fertile areas .
2- These cause lodging of plants like wheat , rice , maize , oat , sugarcane , etc .
3- These increase the rates of evaporation and transpiration leading to desiccation which cause dwarfism in the plants .
These drugs act as depressant and analgesic .
Thus they are commonly called pain killers.
They act on central nervous system and gastrointestinal tract e.g. Opium .
Opium is obtained from the dried latex of unripe capsules of white poppy plant , papaver somniferum .
The opium derivatives include morphine and codein , heroin , commonly called black or brown sugar .
Heroin is formed from morphine by acetylation
It is more powerful analgesic than morphine , but causes drug addiction .
Most dangerous opiate is heroin and is either smoked or inhaled or injected .
When heroin is injected intra venously it produces rapid response called rush .
The codein is a wild analgesic but causes syrup .
Asynthetic drug pethidine has similar effect to hose of opiates.
Tobacco is obtained from dried and cured leaves of tobacco plant , Nicotiana tobaccum .
The particulate constituent of tobacco is tar , aromatic hydrocarbon , phenol , cresol , benzaopyrene , N-nitrosonor nicotine and nicotine .
The gaseous constituent of tobacco is CO ,Nitrosomine , hydrazine , formaldehyde , nitrogen oxide .
Smoking of tobacco causes lung cancer , cardio vascular diseases , pulmonary tuberculosis , bronchitis , gastric and duodenal ulcer.
The Structure and Functions of Liver The liver is the largest solid organ in the body. It removes toxins from the body's blood supply, ...
