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Air Pollution Air pollution is one of the major problems created by modern man. It is estimated that about 100 million tons of waste are poured into our atmosphere each y
Explain Cephalic Phase or Neural Phase 45% of the total gastric secretion is discharged in this phase. The flow of juice occurs before food reaches the stomach. Sight of food,
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How to make a simple apparatus for distilling water You can make a easy water-distilling apparatus from a flask, and a length of glass or rubber tubing. Fit the flask with a si
Weighing moisture again The similar experiment can be done with a bath towel. Wet the towel and wring it out. Hang it on a coat hanger. Hang the coat hanger on single end of a
Explain Transport of Oxygen by Red Blood Cells Oxygen combines with haemoglobin, i.e., the red pigment in red blood cells. It combines with oxygen in the lungs, transports it a
What is the earths core made of? Ans) The outer earth core is liquid and the inner is solid. Both parts are of alloy of two metals - iron and nickel, permitting the rise of the
What is happening to the length of a day on the Earth, as a result of the gravitational pull of the Moon?
Sterilizing water by boiling The presence of tiny living plants and animals makes water inappropriate for drinking. Such forms of life can only be seen by a microscope. We can
Making a precision reflecting telescope It is fairly beyond the scope of this book to include the intricate details for mirror grinding and testing. Though, some teachers may w
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