Ans : Leonardo da Vinci.
Ans : Joseph Lister.
Ans : Moulting takes place because of a number of reasons. Birds discard old feathers for new ones. This is also referred to as moulting. Snakes keep on growing, unlike human beings whose growth stops after attaining adulthood. The snakes discard their skins for a new one. Lobsters, crabs, etc have a hard covering outside the body to support. The animal then breaks out of the old cover and quickly grows before the new chitin already recreated by die tissues underneadi, can harden. Frequently during such periods, the animal hides, since it has no protection then.
Ans : During solar eclipse, the ultraviolet rays are in such high proportion in sunrays, that they can cause irrepairable damage to the eye.
Ans : Sputnik-I, launched by the Russians
Ans : Euclid.
Ans : Lactobacillus.
Ans : Scotophyte
Ans : Concrete is a rock like substance made from cement, natural sand, stone and water. Cement and water react chemically and serve like glue to bond the stones and form a hardened mass. When the material is still in a "plastic state" it can be very easily formed into various shapes. But once the concrete sets (hardens) no changes can be made.
Ans : Zirconium
Ans : Iron
Ans : 120 days.
Ans : Marie and Pierrie Curie
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 : The ozone layer.
Ans : Anders Celsius first proposed the centigrade thermometer, which has a scale of 100 degrees separating the boiling and freezing points of water.
Ans : Mumbai
Ans : Zero degrees on the Celsius scale.
Ans : EliasHoweofUSAin 1845.
Ans : Lactic Acid is formed when the glycogen or sugar in the muscles is used. This makes us feel tired.
Ans : Ochlophobia
Ans : Sir Humphry Davy.
Ans : Calcium.
Ans : Italy, Iceland, Japan, New Zealand, USA and Russia.
Ans : William Einthoven
Ans : Chlorophyll.
Ans : Four. Right auricle, left auricle, right ventricle and left ventricle.
Ans : The enamel that covers teeth.
Ans : By changing its colour and merging with the background.
Ans : Jupiter's weapon.
Ans : Venus and Uranus.
Ans : Valentine
Ans : The needle of the compass always points towards the magnetic north pole. This indicates the direction in which the ship is moving.
Ans : Trichloromethane
Ans : Platypus and Echidna.
Ans : Bones
Ans : Hybridisation is the mating or crossing of two parents of different species or varieties. Thus a mule is a hybrid of a horse and an ass. In the case of flowers, hybridisation is done by taking pollen from one plant and dusting it on the pistils of another plant. A bag is placed over the pistils until the seeds are developed. Then the seeds are planted and a hybrid is formed.
Ans : The planes leaving fume behind are jet planes. In a basic jet engine air is compressed and forced into a chamber, where fuel is added. Here combustion (burning) takes place. The hot gases that are produced escape from the base of the engine. This pushes the aircraft forward. The white fumes that you see are the hot gases as they escape out. Since the temperature around the jet is low, the fume condenses and becomes visible.
Ans : Tuberculosis (T.B)
Ans : When certain proteins get oxidised, in the presence of an enzyme called luciferase, light is produced. Fireflies have special light organs on the underside of the abdomen. Here in the presence of luciferase, light is produced.
Ans : Even if it had some atmosphere, its mass is so low that gravity on the surface is not enough to retain the atmosphere.
Ans : If you wish to carry sand or any solid substance from one place to another, you can carry little if there are straight metal strips. A pail can carry much more. In the case of air, which is a fluid, a slightly curved blade is enough to help circulate air in the room.
Ans : The earth rotates on its axis even while it revolves around the sun. The rotation results in night and day. As the earth revolves around the sun, it also tilts on its axis. This tilt causes changes in the earth's position, which results in the seasons.
Ans : The Greek mathematician Euclid around 300 B.C.
Ans : Amino acids
Ans : Henrich Hertz
Ans : It enters the cavity of the right auricle through two veins - one called the superior vena cava enters from the head region and die other called the inferior vena cava enters from the lower or posterior region of the body.
Ans : Vitamins of the B and C group.
Ans : Iron.
Ans : Spraying of certain chemicals into clouds to induce rain.
Reading Corner ( Ctrl + Mouse Click)
Managed Services By: Samikshaa Softwares