Question

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for 20 MCQ Question on Microorganisms Friend and foe class 8 pls.
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Answer 1

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1. Which of the following is a disease caused by protozoans?

Tuberculosis

Polio

Malaria

Typhoid

Answer: (C) Malaria

2. Which of the following diseases is caused by a bacteria?

Chicken pox

Tuberculosis

Dengue

Polio

Answer: (B) Tuberculosis

3. Some plants have nitrogen-fixing bacteria in their root nodules. What are these bacteria called?

Blue green algae

Nitrosomonas

Azotobacter

Rhizobium

Answer: (D) Rhizobium

4. In order to take precautionary steps to control dengue, we must take measures to stop the breeding of:

Aedes mosquito

Fleas

Fire ants

Anopheles mosquito

Answer: (A) Aedes mosquito

5. Partial sterilization of a product such as milk at a high temperature is known as:

Pasteurization

Filtration

Pickling

Refrigeration

Answer: (A) Pasteurization

6. Living organisms which are invisible to the naked eye are called _________ .

Particles

Molecules

Microorganisms

Macroorganisms

Answer: (C) Microorganisms

7. Which of the following is a communicable disease?

Diabetes

Chicken pox

Alzheimer’s

Cancer

Answer: (B) Chicken pox

8. Vaccines are made up of:

Chemicals

Weak microorganisms

Viruses

Drugs

Answer: (B) Weak microorganisms

9. The bacterium present in curd is:

Salmonella typhi

Lactobacillus

Penicillin

Vibrio cholera

Answer: (B) Lactobacillus

10. While baking cakes, yeast reproduces rapidly and produces ___ gas.

Hydrogen

Oxygen

carbon dioxide

nitrogen

Answer: (C) carbon dioxide

11. ______ is used for the production of alcohol and wine.

Yeast

Mosquito

Ant

Algae

Answer: (A) Yeast

12. Which of the following diseases can be cured using antibiotics?

AIDS

Dengue

Typhoid

Malaria

Answer: (C) Typhoid

13. Which organisms are microscopic and dependent on host organisms for reproduction?

Algae

Protozoa

Viruses

Bacteria

Answer: (C) Viruses

14.  _______ are the agents that act as carriers of a pathogen and spread diseases.

Vectors

Microbes

Parasites

DNA

Answer: (A) Vectors

15. An infectious disease is ___________ .

caused only by bacteria

spread from person to person

spread from animal to animal

caused only by viruses

Answer: (B) spread from person to person

16. Which one of the following is not a method of food preservation?

Salting

Drying

Boiling

Pickling

Answer: (C) Boiling

17. Which among the following statements is not associated with food preservation?

Prevention of decay or spoilage

Decreased shelf life

Air-tight sealing

Storage for future use

Answer: (B) Decreased shelf life

18. Which one of the following is not produced by the process of fermentation?

Cheese

Milk

Yoghurt

Wine

Answer: (B) Milk

19. A plant disease called citrus canker is caused by a _________ .

Bacteria

Fungi

Protozoa

Virus

Answer: (A) Bacteria

20. Which among the following pathogens causes cholera?

Bacteria

Protozoan

Fungus

Virus

Answer: (A) Bacteria

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Answer 2

1). ||

2) III

3) III

4) III

5) III

6) II

7) II

8) I

9) II

10) II

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