Match the following: Column I Column II (a) Lactobacillus (i) Algae (b) Aspergillus (ii) Protozoa (c) Spirogyra (iii) Fungi (d) Paramecium (iv) Bacteria

(a)- (iv) Bacteria can be of various shapes. They play an important role in our life. Lactobacillus is a rod-shaped bacterium found in the curd. (b)- (iii) Fungi are a group of heterotrophic microorganisms which do not have chlorophyll and feed on dead and decaying matter. For e.g. Aspergillus . (c)-(i) Algae are microscopic unicellular or multicellular plant-like microorganisms. They are photoautotroph. For e.g. Spirogyra . (d)-(ii) Protozoa are a group of unicellular microorganisms which shows animal like features. Diseases like dysentery and malaria are caused by protozoans. Paramecium is a protozoan. Column I Column II (a) Lactobacillus (i) Bacteria (b) Aspergillus (ii) Fungi (c) Spirogyra (iii) Algae (d) Paramecium (iv) Protozoa

Match the items given in Column I with those of Column II. Column I Column II (a) Polio (i) Legumes (b) Malaria (ii) Antibiotics (c) Rhizobium (iii) Yeast (d) Alexander Fleming (iv) Viral disease (e) Bread making (v) Protozoan disease

(a)-(iv) Microorganisms are the organisms which can not be seen through naked eyes. Many diseases are caused by such pathogens. Polio is a viral disease transmitted by air or water. It can be prevented by vaccination. (b)-(v) Malaria is a vector-borne protozoan disease transmitted by female anopheles mosquito. It can be prevented by using mosquito net and repellents. (c)-(i) Rhizobium is a rod-shaped bacterium found in the roots of leguminous plants. It helps in nitrogen fixation. (d)-(ii) The chemical preparations which are used to stop the growth of microorganisms are called antibiotics. Alexander Fleming discovered the first antibiotic by a Penicillium mould. It is used to treat many bacterial infections. (e)-(iii) Yeast is a fungus used in bread making. It is widely used in the baking industry. It is also used in the preparation of alcohol through fermentation. Column I Column II (a) Polio (iv) Viral disease (b) Malaria (v) Protozoan disease (c) Rhizobium (i) Legumes (d) Alexander Fleming (ii) Antibiotics (e) Bread making (iii) Yeast

Match the names of scientists are given in Column I with the discovery made by them given in Column II. Column I Column II (a) Louis Pasteur (i) Penicillin (b) Robert Koch (ii) Anthrax bacterium (c) Edward Jenner (iii) Fermentation (d) Alexander Fleming (iv) Smallpox vaccine

(a)-(iii) Louis Pasteur discovered the process of fermentation in which sugar is converted into alcohol. This conversion is carried out by yeast. (b)-(ii) Robert Koch discovered the Anthrax bacterium, which causes Anthrax disease in cattle and humans. (c)-(iv) Edward Jenner discovered the smallpox vaccine in 1798. This disease was caused due to virus and spread through the air. This disease is finally eradicated from the world. (d)- (i) Antibiotics are the chemical substances that are used to stop the growth of bacteria. Alexander Fleming discovered the first antibiotic named Penicillin from a mould in 1929. Column I Column II (a) Louis Pasteur (iii) Fermentation (b) Robert Koch (ii) Anthrax bacterium (c) Edward Jenner (iv) Smallpox vaccine (d) Alexander Fleming (i) Penicillin

E M B I B E

All in One - SCIENCE CBSE Class 8>Chapter 2 - Microorganisms: Friend and Foe>Chapter Practice>Q 7

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Earn 100

Foot and mouth disease is a bacterial disease in animals.

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Important Questions on Microorganisms: Friend and Foe

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All in One - SCIENCE CBSE Class 8>Chapter 2 - Microorganisms: Friend and Foe>Chapter Practice>Q 8

Microorganisms can be found only in air and water.

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All in One - SCIENCE CBSE Class 8>Chapter 2 - Microorganisms: Friend and Foe>Chapter Practice>Q 9

Protozoa causes disease like dysentery and malaria.

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All in One - SCIENCE CBSE Class 8>Chapter 2 - Microorganisms: Friend and Foe>Chapter Practice>Q 10

Jams, jellies and squashes are preserved by adding salt.

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All in One - SCIENCE CBSE Class 8>Chapter 2 - Microorganisms: Friend and Foe>Chapter Practice>Q 11

The element nitrogen cannot be utilised by the living organisms.

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All in One - SCIENCE CBSE Class 8>Chapter 2 - Microorganisms: Friend and Foe>Chapter Practice>Q 12

Viruses can be seen by simple microscope.

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All in One - SCIENCE CBSE Class 8>Chapter 2 - Microorganisms: Friend and Foe>Chapter Practice>Q 1

Match the following:

Column I	Column II
(a) Lactobacillus	(i) Algae
(b) Aspergillus	(ii) Protozoa
(c) Spirogyra	(iii) Fungi
(d) Paramecium	(iv) Bacteria

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All in One - SCIENCE CBSE Class 8>Chapter 2 - Microorganisms: Friend and Foe>Chapter Practice>Q 2

Match the items given in Column I with those of Column II.

Column I	Column II
(a) Polio	(i) Legumes
(b) Malaria	(ii) Antibiotics
(c) Rhizobium	(iii) Yeast
(d) Alexander Fleming	(iv) Viral disease
(e) Bread making	(v) Protozoan disease

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8th CBSE

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All in One - SCIENCE CBSE Class 8>Chapter 2 - Microorganisms: Friend and Foe>Chapter Practice>Q 3

Match the names of scientists are given in Column I with the discovery made by them given in Column II.

Column I	Column II
(a) Louis Pasteur	(i) Penicillin
(b) Robert Koch	(ii) Anthrax bacterium
(c) Edward Jenner	(iii) Fermentation
(d) Alexander Fleming	(iv) Smallpox vaccine

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