Match the organisms in Column A with their action in Column B . Column A Column B (i) Bacteria (a) Fixing nitrogen (ii) Rhizobium (b) Setting of curd (iii) Lactobacillus (c) Baking of bread (iv) Yeast (d) Causing malaria (v) A protozoan (e) Causing cholera (vi) A virus (f) Causing AIDS (g) Producing antibodies.

(i)-(e) Cholera is caused due to a bacterium- Vibrio cholerae . It is transmitted through contaminated water and food. (ii)-(a) Rhizobium is a nitrogen fixing bacteria found in association with root nodules of leguminous plants. It increases the fertility of soil. (iii)-(b) Lactobacillus multiplies in milk and converts it into curd. They are also involved in making cheese, pickles and many other products. (iv)-(c) Yeast is used in baking of bread. During fermentation the dough rises due to carbon dioxide released. The bread becomes soft and fluffy on baking. (v)-(d) A protozoan ( Plasmodium ) causes malaria which is transmitted through female Anopheles mosquito. (vi)-(f) AIDS is caused by a virus. A virus is a microorganism which reproduces only inside the cells of the host organism. Column A Column B (i) Bacteria (e) Causing cholera (ii) Rhizobium (a) Fixing nitrogen (iii) Lactobacillus (b) Setting of curd (iv) Yeast (c) Baking of bread (v) A protozoan (d) Causing malaria (vi) A virus (f) Causing AIDS

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SCIENCE TEXTBOOK FOR CLASS 8>Chapter 1 - Microorganisms : Friend and Foe>Exercises>Q 2

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The process of conversion of sugar into alcohol is called

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Important Questions on Microorganisms : Friend and Foe

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8th Jammu and Kashmir Board

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SCIENCE TEXTBOOK FOR CLASS 8>Chapter 1 - Microorganisms : Friend and Foe>Exercises>Q 3

Match the organisms in Column A with their action in Column B.

Column A	Column B
(i) Bacteria	(a) Fixing nitrogen
(ii) Rhizobium	(b) Setting of curd
(iii) Lactobacillus	(c) Baking of bread
(iv) Yeast	(d) Causing malaria
(v) A protozoan	(e) Causing cholera
(vi) A virus	(f) Causing AIDS
	(g) Producing antibodies.