Match the correct answer. Column A Column B a. Plasmodium i. nitrogen fixation b. Rhizobium ii. curdling of milk c. Lactobacillus iii. baking of bread d. yeast iv. causes malaria e. bacteria v. causes cholera f. virus vi. causes AIDS NOTE: In the question body, instead of protozoan, bacteria word has been added to avoid the ambiguity.

(a) - (iv) Malaria is a water-borne disease. Plasmodium is a protozoan which causes a disease called malaria in humans. It is commonly known as 'Malarial Parasite' (MP). It is transmitted through carrier female Anopheles mosquitoes. (b) - (i) Bacteria such as Rhizobium present in the roots of leguminous plants and certain blue-green algae present in the soil can fix atmospheric nitrogen and convert into usable nitrogenous compounds. (c) - (ii) The bacteria that are responsible for curd formation are Lactobacillus . They are very good for gut health. They help in producing lactic acid, which may prevent harmful bacteria from colonizing the intestines. (d) - (iii) Yeast is a unicellular eukaryotic fungus. Fungi can be grouped into yeast and moulds. The fungus that is involved in fermentation is yeast and it is also used in food industries i.e., used to make bread and beer. (e) - (v) Cholera is an infectious and fatal bacterial disease of the small intestine typically contracted from infected or contaminated water supplies and causing severe vomiting and diarrhoea. It is caused by a comma-shaped organism called Vibrio cholerae. (f) - (vi) Viruses are the intracellular obligate parasites and can undergo reproduction in the presence on the host body. They are smaller than bacteria and are only visible through an electron microscope. Acquired immunodeficiency syndrome (AIDS) is one of the diseases caused by the virus HIV. Column A Column B a. Plasmodium iv. causes malaria b. Rhizobium i. nitrogen fixation c. Lactobacillus ii. curdling of milk d. yeast iii. baking of bread e. bacteria v. causes cholera f. virus vi. causes AIDS

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I Explore 3rd EDITION A Science Textbook 8>Chapter 2 - Microorganisms: Friend and Foe>Check Point>Q 1

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8th CBSE

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Mushroom is an autotroph.

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Important Questions on Microorganisms: Friend and Foe

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8th CBSE

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I Explore 3rd EDITION A Science Textbook 8>Chapter 2 - Microorganisms: Friend and Foe>Check Point>Q 3

Mention two benefits of protozoa and algae.

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I Explore 3rd EDITION A Science Textbook 8>Chapter 2 - Microorganisms: Friend and Foe>Check Point>Q 1

Food poisoning is usually caused by _____. (bacteria/ dust/ smoke)

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8th CBSE

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I Explore 3rd EDITION A Science Textbook 8>Chapter 2 - Microorganisms: Friend and Foe>Check Point>Q 1

_____ are used to make cheese and yoghurt. (Bacteria/Fungi/Virus)

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8th CBSE

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I Explore 3rd EDITION A Science Textbook 8>Chapter 2 - Microorganisms: Friend and Foe>Check Point>Q 2

Match the correct answer.

Column A	Column B
a. Plasmodium	i. nitrogen fixation
b. Rhizobium	ii. curdling of milk
c. Lactobacillus	iii. baking of bread
d. yeast	iv. causes malaria
e. bacteria	v. causes cholera
f. virus	vi. causes AIDS