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Below you will find MCQ Questions of Chapter 2 Microorganisms Friend and Foe Class 8 Science Free PDF Download that will help you in gaining good marks in the examinations and also cracking competitive exams. These Class 8 MCQ Questions with answers will widen your skills and understand concepts in a better manner.

MCQ Questions for Class 8 Science Chapter 2 Microorganisms Friend and Foe with Answers

MCQ Questions for Class 8 Science Chapter 2 Microorganisms Friend and Foe with answers

1. Babesia bigemina causes_____________.

(a) Rinderpest

(b) Tick fever

(c) Canker

(d) Diarrhoea

► (b) Tick fever

2. Microbiology is the study of :

(a) Useful products prepared from microbes

(b) Parts of living organisms

(c) Microbes

(d) Diseases caused by microorganisms

► (c) Microbes

3. Protective covering that encloses microorganisms during unfavourable conditions:

(a) cyst

(b) cell wall

(c) test

(d) capsule

► (a) cyst

4. Which one of the following is called pond silk?

(a) Volvox

(b) Spirogyra

(c) Chlamydomonas

(d) Euglena

► (b) Spirogyra

5. Confusion technique uses

(a) Juvenile hormone

(b) Ecdysone

(c) Pheromone

(d) A combination of hormones

► (c) Pheromone

6. Agents in infectious diseases responsible are called

(a) Germs

(b) Cells

(c) Virus

(d) Enzyme

► (c) Virus

7. The bacterium present in curd is:

(a) Salmonella typhi

(b) Lactobacillus

(c) Penicillin

(d) Vibrio cholera

► (b) Lactobacillus

8. Microbes are present:

(a) everywhere

(b) soil, air, polluted water

(c) water, soil

(d) air, water

► (a) everywhere

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

(a) Microbes

(b) Parasites

(c) Vectors

(d) DNA

► (c) Vectors

10. Common tick fever is caused by___________.

(a) Protozoan Babesia

(b) Protozoan Eimeria

(c) Bacterium Corynebacterium

(d) Tapeworm

► (a) Protozoan Babesia

11. Which of the following microorganisms play an important role in maintaining the balance of nitrogen gas in the atmosphere?

(a) Viruses

(b) Bacteria

(c) Algae

(d) Protozoa

► (b) Bacteria

12. Which of these are not included in the prevention of measles?

(a) Vaccination

(b) Antibodies

(c) Both (a) and (b)

(d) None of the above

► (b) Antibodies

13. The carnivorous fish Gambusia, introduced in the lakes, ponds, etc., control a deadly disease in India, feeds on the larvae of

(a) Nephantis

(b) Dragonfly

(c) Anopheles

(d) All of the above

► (c) Anopheles

14. Microorganisms are never found in a :

(a) ice cold water

(b) hot water spring

(c) marine water

(d) none of the above

► (d) none of the above

15. Microbes which have adapted themselves so that they can survive and even thrive in conditions that are normally fatal most lifeforms

(a) Hyperthermophiles

(b) Extremophiles

(c) Thermophiles

(d) None of the above

► (b) Extremophiles

16. Fungi reproduces by

(a) Fission

(b) Fusion

(c) Seed formation

(d) Spore formation

► (d) Spore formation

17. What process takes place when yeast is added to grape juice and left for a week?

(a) Decomposition

(b) Fermentation

(c) Distillation

(d) Oxidation

► (b) Fermentation

18. Name the single-celled microorganism which found in the glacier to deserts and hot spring.

(a) Algae

(b) Virus

(c) Bacteria

(d) None of the above

► (b) Virus

19. Which one is not correctly matched?

(a) Root-knot Disease - Meloidogyne javanica

(b) Smut of Bajra - Tolyposrium

(c) Covered Smut of Barley - Ustilago hordei

(d) Late Blight of Potato - Phytophthora infestans

► (d) Late Blight of Potato - Phytophthora infestans

20. Typhoid was discovered by

(a) Fleming

(b) Robert Koch

(c) Bretannaeo

(d) Kornberg

► (a) Fleming

21. Name the Living organism which we cannot see by the naked eye.

(a) Microorganisms

(b) Chromic organisms

(c) Fermentation

(d) Lyophobic organisms

► (a) Microorganisms

22. Which of the following terms is given to the microorganisms that cause diseases?

(a) Antigens

(b) Antibodies

(c) Pathogens

(d) Vectors

► (c) Pathogens

23. Which two words are synonyms?

(a) Microorganism and pathogen

(b) Microorganism and microbe

(c) Microbe and aerobe

(d) Microbe and anaerobe

► (b) Microorganism and microbe

24. Bt toxin protein crystals present bacterium Bacillus thuringiensis, do not kill the bacteria themselves because

(a) Bacteria are resistant to the toxin

(b) Toxins occur as inactive protoxins in bacteria

(c) Bacteria enclose toxins in a special sac

(d) None of the above

► (b) Toxins occur as inactive protoxins in bacteria

25. Which of the following bacteria lives symbiotically in pea plants?

(a) Rhizobium

(b) Nitrosomonas

(c) Azotobacter

(d) Clostridium

► (a) Rhizobium

26. Which of the following options is/are true about the diseases, microorganisms which cause them and the symptoms of the diseases?

(a) Malaria, Protozoan, Fever and Chills

(b) Hepatitis B, Virus, Swollen liver

(c) Cholera, Virus, Vomiting, diarrhea

(d) Both (a) and (b)

► (d) Both (a) and (b)

27. Cholera

(a) Is a non-communicable disease

(b) Spreads through food and water

(c) Spreads through air

(d) Spreads through mosquitoes

► (b) Spreads through food and water

28. Which of the following bacteria causes Cholera?

(a) Streptococcus

(b) Clostridium

(c) Pasteurella

(d) Vibrio

► (d) Vibrio

Hope the given MCQ Questions will help you in cracking exams with good marks. These Microorganisms Friend and Foe MCQ Questions will help you in practising more and more questions in less time.

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