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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 Internal Defence Mechanism Body's internal defence mechanism is carried out by white blood corpuscles (WBCs), macrophages, inflammatory reactions, fever, interferons, c
Role of Communication in the Economic Development: This is as much as one-sixth of the world's population. In the year 1981,446 million Indians were illiterate, i.e., they co
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Explain the term - Ants Ants are the most widespread species of insects in soil and consume plant residues, but are more active in humifying insects than plants.
Explain Extrasystole and Compensatory Pause During the relaxation period, cardiac muscle is in the relative refractory period i.e. sleeping but only just. If a sufficiently st
what is the solution of the water polution
Explain Hypoxia and its Types Hypoxia is the oxygen deficiency at the tissue level below the physiological level. There are four types of hypoxia. Let's get to know them. 1.
how are the size and mass different from earth ?
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