Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

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 ?

282 Views

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

268 Views

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

127 Views

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

131 Views

35.

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

296 Views

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

236 Views

37. Name any two species of fungus, which are used in the production of antibiotics.

238 Views

38. Make a table showing industrial products obtained from activities of bacteria.

275 Views

39. Tabulate the list of common antibiotics, organisms producing them

Name of antibiotic	Name of Producing Organism
Penicillin	Penicillium
Streptomycin	Streptomyces griseus
Bacitracin	Bacillus licheniformis
Chloromycetin	Streptomyces venezuelae
Tetracycline	Streptomyces aureofaciens
Cephalosporins	Acremonium chrysogenum

176 Views

40. What are “broad spectrum antibiotics” ?

169 Views