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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.
Respiration: Food + oxygen -> carbon dioxide + water + energy Food is not only a source of energy, but also the nutrients used to build up the organisms' bodies. So we
why there is 28 day in february month
Define Carbohydrates Sugar, like a candle, can burn but burning requires oxygen. We eat to do work. To do their work, cells need an important group of food known as 'carbohydr
Let us recall briefly what all we have learnt about fire hazards in this unit. Fire accident can happen due .to a number of reasons, like, flammable liquids, faulty electrical and
Define Calculi and casts - abnormal constituent of urine An abnormal concretion in the body usually formed of mineral salts and found in the gall bladder, kidney or urinary bla
Advantages of water in chemical weathering Water is an essential factor of chemical weathering and when it contains dissolved salts and acids it is all the more effective. It
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How different pressures of air force water from a container Fit a test tube with a two-hole stopper. By one hole place a length of glass tube which extends into the test tube a
Botany: In the Bronze and the Iron Ages, agriculture became the principal mode of production of man in all lands. It is, thus, not surprising that in India, botany and elementa
Remove the wastes from the body - Function of Kidney Remove the wastes from the body. Many metabolic waste products such as urea, uric acid, ammonia and creatinine need to be f
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