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Q. Do you know of any activity which may be polluting this water source? Answer: The discharge of waste water from homes, industries, hospitals, etc. into the river pollutes thi
what are the problems
How to make an experimental biter Fit a one-hole stopper carrying a short length of glass tube into the small end of a lamp chimney. Put a little cotton wool in the bottom and
Apart from acidic waste, bromine waste is also treated using this method. Exercises Examples: Perchloric acid, sulphuric acid, hydrochloric acid, nitric acid, phosphoric acid
A hair hygrometer This device will enable you to read the relative humidity directly without the use of tables. Procure a few human hairs about 30 cm long. Free them from gr
Life of a Star: A young star is thought to be composed largely of hydrogen gas. Hence, the most likely place for a star to be born is in one of the numerous clouds of hydrog
The methods of food processing by covering the two major methods- thermal processing dehydration. Food processing methods which include freezing, microwave proces
discuss determinants of food security
The effect of soil on growing things Get samples of a fertile soil from a flower or vegetable garden, from a wood, from a place where a cellar is life form dug, from a sandy pl
stick pictures of carbohydrates,fates,proteins,minerals&different types of vitamin containing foods
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