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Microbes in Human Welfare

Short Answer Type

31. Bacteria cannot be seen with the naked eyes, but these can be seen with the help of a microscope. If you have to carry a sample from your home to your biology laboratory to demonstrate the presence of microbes under a microscope, which sample would you carry and why ?

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32. Give examples to prove that microbes release gases during metabolism.

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33. How is curd prepared ? How prepration of curd improves its nutritional value ?

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34. Make a list of any 3 Milk products obtained from the activities of bacteria.

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35.

Name some traditional Indian foods made of wheat, rice and Bengal gram (or their products) which involve use of microbes.

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36. In which way microbes have played a major role in controlling diseases caused by harmful bacteria ?

Antibiotics produced by microbes play a major role in controlling diseases caused by harmful bacteria. The antibiotics retard or stop the growth of various microbes and thus the disease can be cured.

Example : Penicillin produced by Penicillium chrysogenum is active against various species of Staphylococci and Streptococci.

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