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Moisture comes from other plants
Secure a flower pot which has some bean or pea seedlings that are 10 or 15 cm in height. Cover the top of the pot with cellophane or sheet rubber, pinning it closely approximately the stems of the plants so no soil is uncovered. Invert a clean, dry glass jar over the plants and view after an hour.
Determine in brief about the soil texture The texture is generally determined by the relative proportions of sand, silt and clay. If various size fractions of the particles co
To measure the volume of air in the longs Invert a bottle full of water so that its neck is in the surface of water in ajar. Introduce a glass or rubber tube into the neck and
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
economic importance
Chain Reaction: When the atomic nucleus splits, it not only gives off energy, but also throws out two or three more neutrons. 'These new neutrons can, in turn, split two or
A simple mercury barometer Seal single end of a glass tube about 80 cm in length by rotating it in a gas flame. The tube should be held as almost vertical as possible. Join a s
Biological Basis of Aggression: Studies show that mild electrical stimulation of a specific region of the hypothalamus - produces aggressive behaviour in animals. When a cat'
Define White Blood Corpuscles as Internal Defence Mechanism The white blood cells are probably the most important part of our immune system. You may recall reading about the wh
Gloves : Gloves should be worn when transferring toxic, radioactive and carcinogenic compounds, irritants and corrosive liquids. The practice of wearing rubber gloves continuously
1. The red shift seen in all distant galaxies, whose size is proportional to its distance from us, what effect will this have on planet Earth?
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