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     The steam engine uses the power generated from steam pressure to move. Coal is used in furnaces to heat water in the boiler to generate steam. Steam pressure makes the wheels of the engine move.

Renal Failure and Technology for Survival

     The kidney slowly deteriorates and stops functioning. The symptoms are water retention, acidosis, anaemia and increase in blood urea level.

Excretion in Plants

     In plants, breakdown of substances is much slower than in animals. Hence accumulation of waste is much slower and there are no special organs of excretion.


     The removal of harmful and unwanted toxic waste products of metabolism is known as excretion.

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