What do you mean by the following terms:
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Paleontology: Study of pre-historic life through fossil analysis
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Limnology: scientific study of the physical, geographical, chemical and biological aspects of lakes or inland fresh water systems.
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Sericulture: art of raising silk worms
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Agronomy: scientific management of farms and crop production
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Histology: scientific study of the minute structure of tissues in organisms
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Apiculture: science of bee keeping
Match the correct composition of air:
(already matched
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Nitrogen: 78.09%
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Oxygen: 20.94
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Carbon dioxide: 0.031%
Name the gas used in any two of the following:
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Refrigerator: Freon
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Aerated Drink: CO2
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Kitchen gas stove: CH4 (Methane)
Name the two minerals exported by Pakistan
Answer: Gypsum and Common Salt
Name the industries which depend upon the following:
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Common Salt: used in manufacturing tetraethyl lead, used as cooling agent in nuclear reactors
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Sulphur: used in manufacturing sulfuric acid, fertilizers, chemicals, explosives, dyestuff, petroleum refining, vulcanization of rubber, and fungicides
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Silicon: used in alloys and manufacturing of glasses
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Gypsum: used as prefabricated wall board or industrial or building plaster, manufacturing of cement, also used in agriculture sector
Name the chemicals which are added in the following either for preservation or for nutrition reasons:
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Fuits and Fruit Juices: Sodium meta-bi Sulphate for preservation
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Drinking Water: Chlorine for preserving and cleaning from germs
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Vegetable Ghee: Vitamin A & D added for nutritional purposes
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Meat: Sodium Chloride (common salt) for preservation
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Bread: preserved by using salt, sugar or both. Nitrates and nitrites also used for the purpose.