• Microorganisms - Friend and Foe (Class VIII)
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Microorganisms - Friend and Foe (Class VIII)

Description: Microorganisms Friend and Foe
Number of Questions: 16
Created by:
Tags: Microorganisms - Friend and Foe. VIII Evaporation and its Use Methods of Separation: Handpicking and Threshing Making Solutions of Substances in Varying Quantity in Water Commerical Use of Microorganisms Nature and Characteristics of Microorganisms Harmful Effects of Microorganisms and their Preventions Domestic Use of Microorganisms
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Which of the following can be used as food preservative(s)?

a. Sodium benzoate b. Sodium hydroxide c. Citric acid d. Butachlor

  1. Only a and c

  2. Only a and b

  3. Only b and d

  4. Only a and d

  5. Only c and d

Show answer
Correct Option: A
Explanation:

This is the correct option. Sodium benzoate and citric acid can be used as food preservatives.

Which of the following are single-celled microorganisms?

a. Viruses b. Bacteria c. Protozoa d. Fungi

  1. Only a and b

  2. Only b and d

  3. Only a and c

  4. Only a and d

  5. Only b and c

Show answer
Correct Option: E
Explanation:

This is the correct option. Bacteria and protozoa are single-celled microorganisms.

Which of the following do not increase the fertility of soil?

a. Rhizobium bacteria b. Blue-green algae c. Lactobacillus bacteria d. Spirogyra algae

  1. Only a and b

  2. Only b and c

  3. Only a and c

  4. Only c and d

  5. Only a and d

Show answer
Correct Option: D
Explanation:

This is the correct option. Lactobacillus bacteria and Spirogyra algae do not increase the fertility of soil.

Which of the following do not show most of the characteristics of living things and can reproduce and multiply only inside the cells of other organisms?

  1. Viruses

  2. Bacteria

  3. Protozoa

  4. Algae

  5. Fungi

Show answer
Correct Option: A
Explanation:

This is the correct option. Viruses do not show most of the characteristics of living things and can reproduce and multiply only inside the cells of other organisms.

Which of the following diseases cannot be cured with antibiotics?

  1. Influenza

  2. Cholera

  3. Malaria

  4. Typhoid

  5. Athlete's foot

Show answer
Correct Option: A
Explanation:

This is the correct option. Influenza is a viral disease and cannot be cured with antibiotics.

Which of the following are multi-cellular algae?

a. Chlamydomonas b. Diatoms c. Blue-green algae d. Spirogyra

  1. Only a and b

  2. Only b and c

  3. Only a and c

  4. Only c and d

  5. Only a and d

Show answer
Correct Option: D
Explanation:

This is the correct option. Blue-green algae and Spirogyra are multi-cellular algae.

Which of the following fungi is not made up of fine threads called hyphae?

  1. Penicillium

  2. Aspergillus

  3. Rhizopus

  4. Toadstool

  5. Yeast

Show answer
Correct Option: E
Explanation:

This is the correct option. Yeast is not made up of fine threads called hyphae.

Which of the following diseases cannot be prevented by vaccination of children at a proper age?

  1. Tetanus

  2. Diphtheria

  3. Measles

  4. Influenza

  5. Tuberculosis

Show answer
Correct Option: D
Explanation:

This is the correct option. Influenza is a viral disease that cannot be prevented by vaccination of children at a proper age.

In which of the following ways do communicable diseases not spread?

  1. By sharing infected injection needles

  2. By shaking hands with infected persons

  3. By breathing of air containing microorganisms

  4. By taking infected food or water

  5. Through insect bites

Show answer
Correct Option: B
Explanation:

This is the correct option as by shaking hands with infected persons, communicable diseases do not spread.

Match the following:

 
a. Bacteria 1. They do not have chlorophyll and do not show photosynthesis.
b. Fungi 2. They have cell walls, but do not have an organised nucleus and other structures.
c. Algae 3. They are plant-like organisms containing chlorophyll and producing food by photosynthesis.

  1. a - 3, b - 1, c - 2

  2. a - 2, b - 1, c - 3

  3. a - 1, b - 2, c - 3

  4. a - 1, b - 3, c - 2

  5. a - 2, b - 3, c - 1

Show answer
Correct Option: B
Explanation:

This is the correct option. Bacteria have cell walls, but do not have an organised nucleus and other structures. Fungi do not have chlorophyll and do not show photosynthesis. Algae are plant-like organisms containing chlorophyll and producing food by photosynthesis.

Which of the following microorganisms promotes the formation of curd from milk?

  1. Yeast

  2. Acetobacter

  3. Lactobacillus

  4. Penicillium

  5. Rhizobium

Show answer
Correct Option: C
Explanation:

This is the correct option. Lactobacilli promote the formation of curd from milk.

Fermentation is the process of converting sugar into alcohol by the action of

  1. lactobacilli

  2. penicillium

  3. acetobacter

  4. yeast

  5. rhizobium

Show answer
Correct Option: D
Explanation:

This is the correct option. Fermentation is the process of converting sugar into alcohol by the action of yeast.

Which of the following is/are the fungus/fungi that cause(s) food poisoning?

a. Aspergillus b. Salmonella c. Clostridium botulinum

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c

Show answer
Correct Option: A
Explanation:

This is the correct option. Aspergillus is a fungus that causes food poisoning.

Match the following: Agents|Diseases| |a. Fungi|1. Dysentery| |b. Protozoa|2. Typhoid| |c. Bacteria|3. Ringworm|

  1. a - 3, b - 2, c - 1

  2. a - 1, b - 3, c - 2

  3. a - 1, b - 2, c - 3

  4. a - 2, b - 1, c - 3

  5. a - 3, b - 1, c - 2

Show answer
Correct Option: E
Explanation:

This is the correct option. Ringworm is caused by fungi. Dysentery is caused by protozoa. Typhoid is caused by bacteria.

Match the following:

 
Diseases Mode of transmission
a. Measles 1. Air
b. Typhoid 2. Mosquito
c. Dengue 3. Water

  1. a - 1, b - 3, c - 2

  2. a - 1, b - 2, c - 3

  3. a - 3, b - 2, c - 1

  4. a - 3, b - 1, c - 2

  5. a - 2, b - 3, c - 1

Show answer
Correct Option: A
Explanation:

This is the correct option. The mode of transmission of measles is air. The mode of transmission of typhoid is water. The mode of transmission of dengue is mosquito.

Identify the fungal disease(s) of animals from the following:

a. Anthrax b. Foot and mouth disease c. Aspergillosis

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c

Show answer
Correct Option: E
Explanation:

This is the correct option. Aspergillosis in animals is caused by a fungus.

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