Question

*. CU CIUPUIgalSINIS be seen WILL
44. (a) How do houseflies carry disease-causing microbes (or Par
state any two ways of preventing diseases spread by houseflies.
How do mosquitoes carry disease-causing micro-organisms and
(b) Mention any three ways of preventing diseases spread by mosqu
46. (a) What is meant by fermentation ? Name the scientist who disco
(b) Which micro-organism converts sugar into alcohol during fermer
47. (a) How do micro-organisms help in increasing soil fertility ?
(b) How do micro-organisms help in cleaning the environment ?
48. What are antibiotics? What precautions must be taken while taking
49. Why are antibiotics not effective against 'common cold' and 'flu' ?
50. What is the full form of HIV ? Name the disease caused by HIV.
51. Describe how, curd is made from milk. Name the bacterium which
52. Name the micro-organism used in bread-making which makes the
the dough rise ?
53. What is food poisoning? How is food poisoning caused?
54. (a) What is meant by food preservation ? Name any five methods of
(b) How do you preserve cooked food at home?
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Answer 1

51.milk made into with help of lactobacillus commonly called lactic acid bacteria.

52.saccharomyces cerevisiae used for making bread.

50.Human Immuno deficiency Virus.AIDS is caused by the HIV