Ans : Valentina Tereshkova.
Ans : Rajahmundry
Ans : The Arabian camel (or dromedary) has only one hump, while the Bactrian camel has two humps.
Ans : The earthworm is called the farmer's friend because it helps him to keep the soil rich and loose so that plants can grow. As they burrow into soft soil, they swallow some of it, which passes through their bodies and finally is left behind as castings. This is enriched material.
Ans : Glenn Seaborg.
Ans : It is the part of brain that connects with the spinal cord.
Ans : Toads have a dry warty skin while frogs have a smooth moist skin.
Ans : Plywood is made by gluing wide thin slices of wood together in order to make a strong board.
Ans : Citrus fruits are those, which contain citric acid in sizeable amounts. Citric acid gives the citrus fruits their sour taste. Lemons, oranges and limes all contain citric acid.
Ans : Inability to distinguish one or more of the primary colours.
Ans : James Watt
Ans : 2 to 3 weeks.
Ans : In winter we need energy to maintain the body temperature in addition to sustaining normal activities of the body. To meet this requirement of energy we eat more.
Ans : Acron
Ans : Bones
Ans : Venus has thick clouds around it that prevent heat from escaping from its surface.
Ans : Scurvy.s
Ans : Zinc
Ans : Fishes
Ans : Ag
Ans : Cosmic rays are radiation from outer space, which bombard the earth. They constantly strike the molecules of the earth's upper atmosphere. As a result, additional radiations are produced. The atmosphere absorbs most of these rays.
Ans : In nature many animals resort to a number of ways to protect themselves from enemies or predators. This is called camouflage. The Polar Bear, having a white colour is an example of camouflage. Similarly zebra's colour confuses its enemy and serves as a camouflage.
Ans : Nikolaus Otto.
Ans : Au
Ans : Fulcrum is the point about which a bar or lever will rotate, when a force is applied at any distance from that point or axis.
Ans : Bright patches of light are seen at high latitudes above 60° north or south. They are named Aurora Borealis (northern lights) or Aurora Australis (southern lights) depending on their position. The term "Aurora Polaris", polar lights, is a general name for both. The aurora consists of rapidly shifting patches and dancing columns of light of various hues.
Ans : A Tapir is an animal that looks like a pig. It is found in Malaysia and Central and South America.
Ans : Five pairs.
Ans : Foot-pound. Thus if an object weighing one pound were lifted through a distance of a foot, one footpound of work would be done.
Ans : When milk is heated, the water in it starts evaporating. The fat globules present in the milk get separated and float on the top as cream. On further heating, more water vapour is formed. But when it tries to escape, it gets trapped by the thick layer of cream on the top. The water vapour pushes up the layer of cream and forms a bulge, which finally bursts out, causing the spill.
Ans : Sawdust is a bad conductor of heat and slows down the melting of ice.
Ans : To keep themselves cool. When they throw out the tongue while panting, the moisture in the tongue evaporates. This directly results in cooling. Humans keep themselves cool by sweating and then evaporation of the sweat, from a large surface of the skin.
Ans : It has a tightly fitting cap of cork or such material, which is a poor conductor of heat. The bottle has a double layer of glass. Glass too is a poor conductor. There is vacuum between the layers of glass to prevent loss of heat by convection and conduction. If the surfaces are made highly reflective, even radiation can be reduced.
Ans : Abdomen.
Ans : Vitamin D.
Ans : Forces acting on bodies
Ans : Acupuncture.
Ans : They are both mammals.
Ans : In nature, there are moulds and bacteria that attack other organisms in order to obtain nourishment and to reproduce. Antibiotics are chemical substances produced by organisms (usually microorganisms) that are harmful to other bacteria and life forms. If you moisten a piece of stale bread and keep it in the open, there will be a greenish growth on it a little later. That is because of the spread of a mould called Penicillium Notatum. It produces penicillin. Penicillin is a highly effective antibiotic. Most bacteria double every half an hour. Just one bacterium (singular of bacteria) becomes thousands within a few hours. An antibiotic does not permit the multiplication of bacteria. In many cases, the antibiotic does not permit even the survival of bacteria.
Ans : 206
Ans : Sir J.A.Fleming
Ans : Geology.
Ans : Bacteria formerly classified as plants are now classified separately as Prokaryotes. They are so small that we can see them only with a microscope. They are found almost everywhere. Bacteria cause and spread diseases, but there are many bacteria that are helpful to man. Bacteria are responsible for converting grape juice into wine and milk into curd.
Ans : Robert Koch, a famous German physician.
Ans : Christopher Cockerell.
Ans : Blood, phlegm, yellow bile and black bile.
Ans : Camellia Sinensis
Ans : Solanum melongenal
Ans : During the French revolution, France introduced the metric system. The standard of length was related to the dimensions of the earth rather than the dimensions of a human limb.
Ans : Hydrogen
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