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

Match the items given in Column I with those of Column II Column I Column II (a)Tuberculosis (i) Edward Jenner (b) Chicken Pox (ii) Fleming (c) Malaria (iii) L Pasteur (d) Rust of wheat (iv) Fungi (e) Pasteurisation (v) Virus (f) Antibiotic (vi) Bacteria (g) Vaccination (vii) Protozoa

(a)-(vi) Tuberculosis is an air borne disease which easily spreads from an infected person to a healthy person by coughing. This disease is caused by a bacteria. The general preventive measure for this disease include complete isolation of the patient. (b)-(v) Chicken pox is caused by virus it is a communicable disease. (c)-(vii) Malaria is caused by a parasitic protozoan. Female anopheles is the vector of this disease which picks up the parasite from the infeted person when it bites them for blood and spreads to a healthy person. (d)-(iv) Several microorganisms infect the plants. These diseases reduce the yield of the crop. Rust of wheat is a plant disease caused by fungi and spread by air and infected seeds. (e)-(iii) The milk which comes in the packets does not get spoiled as it is pasteurised. Pasteurisation is a preservation technique for milk discovered by Louis Pasteur. In this process milk is heated at high temperature of 70 ° C for 15 to 30 seconds and then cooled quickly in low temperatures. (f)-(ii) Antibiotics are chemicals produced by some microbes and kill some infectious bacteria. It was discovered by Alexander Fleming. (g)-(i) Vaccination is a method to prevent disease. It contains dead or weak pathogen. The vaccine of small pox was discovered by Edward jenner. Column I Column II (a)Tuberculosis (vi) Bacteria (b) Chicken Pox (v) Virus (c) Malaria (vii) Protozoa (d) Rust of wheat (iv) Fungi (e) Pasteurisation (iii) L Pasteur (f) Antibiotic (ii) Fleming (g) Vaccination (i) Edward Jenner

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Protozoa causes disease like dysentery and malaria.

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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 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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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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All in One - SCIENCE CBSE Class 8>Chapter 2 - Microorganisms: Friend and Foe>Chapter Practice>Q 4

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

Column I	Column II
(a)Tuberculosis	(i) Edward Jenner
(b) Chicken Pox	(ii) Fleming
(c) Malaria	(iii) L Pasteur
(d) Rust of wheat	(iv) Fungi
(e) Pasteurisation	(v) Virus
(f) Antibiotic	(vi) Bacteria
(g) Vaccination	(vii) Protozoa

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8th CBSE

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

Is the decomposition of the bodies of dead plants and animals by microorganisms desirable?

Protozoa causes disease like dysentery and malaria.

Important Questions on Microorganisms: Friend and Foe

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