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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 Oxygen toxicity - Histotoxic Hypoxia Exposure to oxygen at increased pressure can produce a marked increase in the dissolved oxygen in blood. It produces toxic effe
Determine about the term Actinomycetes - Soil Flora It have characteristics which are transitional between bacteria and fungi and are sometimes called fungi - like bacteria. Th
Eight students conducted a controlled experiment to demonstrate how walking and running affected their heart rates. Use the data below to answer the following questions. Effects of
Infectious diseases: Some of you may have heard about the great bubonic plague, a fatal disease of the blood, spread by fleas and respiratory secretions. It occurred in epid
Explain the Organ of Perception - Pre-requisites of Colour Perception These are the receptors. Receptors, as you may already know, are the rods and cones cells present in the r
what are all the types of cells
Decline of european science: By the middle of the second century B.C., the Greek empires were collapsing in anarchy andunder the weight of the more vigorous power of Rome. I
Reduction reaction Aldoses and ketoses are reduced to the corresponding polyhydroxy alcohols by sodium borohydride, sodium amalgam, etc. So, in this reaction, glucose
Mechanism of Secretion of Gastric Juice There is always a small quantity of gastric juice present in the stomach even when there is no food in the stomach. This is known as fa
A field trip to study erosion Find some place in the locality where running water has complete damage by cutting gulleys. Take the class to study the erosion. Why was it caused
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