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Floating a needle on water
Thoroughly dry a steel needle. Place it on the tines of a dinner fork and gently smash the surface of the water in a dish with the fork. If you are careful the needle will float as you take the fork away. Look at the water surface closely. Can you see how the surface film seems to curve under the weight of the needle ?
Explain the Hormones in the urine Increased or decreased production of a hormone in the body alters the amount of hormone or its degraded products excreted in the urine. For ex
What are Fatty acids Fatty acids are grouped into two classes, saturated and unsaturated fatty acids. The terms 'saturated' and 'unsaturated' fatty acid may not be new to yo
Determine about the soil humus The organic constituents (organic colloids) are due to mainly the plants and partly the animals. They form only a small fraction and get transfo
Explain Idiopathic Thrombocytopenic Purpura "Thrombocytopenic" means the blood doesn't comprise adequate platelets. "Purpura" means a person has excessive bruising. You may als
which is the heaviest matter in the world
Explain the Control of Salivary Secretion The autonomic control of saliva secretion occurs in two ways, as unconditioned and conditioned reflex. What are these? Let's find out.
Softening hard water by boiling Temporary hardness can be removed from water by boiling. Shake a little temporary hard water with a few drops of soap solution and see if you c
Water Pollution Pollution of fresh water is one of the most serious environmental problems of the world as a whole. In our country most of the rivers and lakes are polluted
Leguminous crop grown under phosphate deficiency conditions may suffer from N deficiency as well. Explain. Rhizobium bacteria infect the roots of leguminous plants and lead to
Explain Error catastrophe theory of Ageing As the cells age, there is a random increase in error in protein synthesis due to insertion of wrong amino acids. They become non- fu
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