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Corrosive Substances : These substances cause severe damage by chemical action when in contact with living tissue or in case of leakage, destroy /damage other materials. Mineral acids like hydrochloric acid and sulphuric acid, sodium hydroxide belong to this class.
Define age related changes in Cardiovascular system There is a decrease in elasticity of the aorta and other large arteries as age increases. Thickness of blood vessels increas
What is clay minerals The fraction of secondary minerals is often mixed with primary minerals and oxides of iron, aluminium and silicon and has a size of less than 0.002
Genetic Engineering: The modem biotechnology revolution is based on the understanding and manipulation of the structure of DNA. DNA is a complex organic molecule that directs
Explain Extrasystole and Compensatory Pause During the relaxation period, cardiac muscle is in the relative refractory period i.e. sleeping but only just. If a sufficiently st
Role of communication in promoting education: Transmission of knowledge and information, which is the first step in education, is obviously possible only through communication
The ability of rock or soil to transmit water is known as its: Permeability
advantages and disadvantages of proroza
Floating in different liquids Obtain a tall, slender glass jar, test tube or bottle, and the following liquids: mercury, carbon tetrachloride, water and kerosene. You will also
Introduction : Here you have need to about the fire hazards, various causes of fires and the precautions to be taken to avoid them. You also learnt about various types of fire ext
What determines sinking and floating? Shape a piece of lead, tin or aluminium foil into the form of a little boat and float it on the water in a pan; now wad the metal foil fro
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