Tag: How to Questions
How is silk obtained from silk worms? Silkworms feed on mulberry leaves which are soft and juicy and ideal for their grazing. Well fed worms start spinning cocoons around …
How did Alexander Fleming discover penicillin Alexander Fleming discovered Penicillin, the first antibiotic by pure accident. One of his bacterial culture in the laboratory became contaminated with a …
How did cooking of food begin? Early man ate raw and uncooked food. The discovery that cooking makes food tastier and last longer must have coincided with the discovery …
How is the picture formed on a TV screen ? The T.V. antenna receives the radio waves, and passes it into the T.V. set. The screen of the set …
How does blood clot and a wound heal? Whenever an injury takes place in which bleeding occur, clotting and blood coagulation are initated to stop the bleeding. Clot formation …
How can the microbial infection be prevented? The microbial infection like cholera, food poisoning etc. can be prevented by keeping ca clean environment. Food containers and drinking water should …
How do the cows keep our planet warm? Till now, cows have been known as dairy animals providing us their nutritious milk besides other things. But they perform another …
How much does the atmosphere weight? The earth is surrounded by a thick blanket of air called the atmosphere. The atmosphere is a mixture of gases, water vapour and …
