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

We have completed the NCERT/CBSE chapter-wise Multiple Choice Questions for Class 8 Science book Chapter 2 Microorganisms: Friend and Foe with Answers by expert subject teacher for latest syllabus and examination. You can Prepare effectively for the exam taking the help of the Class 8 Science Objective Questions PDF free of cost from here. Students can take a free test of the Multiple Choice Questions of Microorganisms: Friend and Foe. Each Questions has four options followed by the right answer. Download the Science Quiz Questions with Answers for Class 8 free Pdf and prepare to exam and help students understand the concept very well.

MCQ Questions for Class 8 Science with Answers

Q1. The bread or dosa dough rises because of the action of:

(i) heat
(ii) grinding
(iii) growth of yeast cells
(iv) none of these

(iii) growth of yeast cells

Q2. Microorganisms are also known as

(i) yeast
(ii) microbes
(iii) viruses
(iv) Amoeba

(ii) microbes

Q3. Microbiology is the study of :

(i) Useful products prepared from microbes
(ii) Parts of living organisms
(iii) Microbes
(iv) Diseases caused by microorganisms

(iii) Microbes

Q4. Which of the following drug is an antipyretic?

(i) Insulin
(ii) Alcohol
(iii) Streptomycin
(iv) Paracetamol

(iv) Paracetamol

Q5. Examples of Multicellular Microorganism are

(i) Algae, Bacteria
(ii) Bacteria and Fungi
(iii) Bacteria and Viruses
(iv) Algae and Fungi

(iv) Algae and Fungi

Q6. Which one of the following is called pond silk?

(i) Volvox
(ii) Spirogyra
(iii) Chlamydomonas
(iv) Euglena

(ii) Spirogyra

Q7. Protozoan shaped like a slipper is:

(i) amoeba
(ii) paramecium
(iii) euglena
(iv) entamoeba

(ii) paramecium

Q8. Microorganisms that causes disease are also known as

(i) pathogens
(ii) fungi
(iii) antigen
(iv) microbes

(i) pathogens

Q9. Malaria is caused by

(i) Protozoa
(ii) Virus
(iii) Algae
(iv) Bacteria

(i) Protozoa

Q10. The status of algae in the aquatic food chain is

(i) consumers
(ii) producers
(iii) host
(iv) small in size

(ii) producers

Q11. Rhizobium found in root nodules of leguminous roots is an

(i) Atmospheric Carbon fixer
(ii) Atmospheric Oxygen fixer
(iii) Atmospheric Nitrogen fixer
(iv) All of the above

(iii) Atmospheric Nitrogen fixer

Q12. Agents in infectious diseases responsible are called

(i) Germs
(ii) Cells
(iii) Virus
(iv) Enzyme

(iii) Virus

Q13. The bacteria was first observed by:

(i) Louis Pasteur
(ii) Antony Von Leuwen Hook
(iii) Robert Hooke
(iv) Robert Koch

(ii) Antony Von Leuwen Hook

Q14. Bacilli are the bacteria that are

(i) rod-shaped
(ii) comma-shaped
(iii) curved-shaped
(iv) spiral

(i) rod-shaped

Q15. What process takes place when yeast is added to grape juice and left for a week?

(i) Decomposition
(ii) Fermentation
(iii) Distillation
(iv) Oxidation

(ii) Fermentation

Q16. Bacteria present in root nodules of pea

(i) Coli
(ii) Plasmodium
(iii) Rhizobium
(iv) Penicillin

(iii) Rhizobium

Q17. The process of conversion of sugar into alcohol by yeast is called

(i) Fermentation
(ii) Pasteurisation
(iii) Alcoholism
(iv) All of the above

(i) Fermentation

Q18. Microbes are present:

(i) everywhere
(ii) soil, air, polluted water
(iii) water, soil
(iv) air, water

(i) everywhere

Q19. In Pasteurisation the milk is heated to about:

(i) 100°C
(ii) 50°C
(iii) 70°C
(iv) 110°C

(iii) 70°C

Q20. Simple, plant-like microorganisms are called

(i) algae
(ii) bacteria
(iii) both (i) and (ii)
(iv) protozoa

(i) algae

Q21. Yeast is not used in the preparation of :

(i) bread
(ii) alcohol
(iii) dhokla
(iv) antibiotic

(iv) antibiotic

Q22. The disease caused by protozoa is

(i) tuberculosis
(ii) polio
(iii) typhoid
(iv) malaria

(iv) malaria

Q23. The microbe for Malaria is carried by

(i) Male Anopheles mosquito
(ii) Female Anopheles Mosquito
(iii) Male Aedes mosquito
(iv) Female Aedes mosquito

(ii) Female Anopheles Mosquito

Q24. Which of these are not included in the prevention of measles?

(i) Vaccination
(ii) Antibodies
(iii) Both (i) and (ii)
(iv) None of the above

(ii) Antibodies

Q25. Atmospheric nitrogen ¡s used for the synthesis of:

(i) plant proteins
(ii) animal proteins
(iii) plant carbohydrates
(iv) none of these

(i) plant proteins

Q26. Medicine that kills or stops the growth of harmful disease-causing microbes is known as

(i) antibiotic
(ii) antibody
(iii) antigen
(iv) vaccine

(i) antibiotic

Q27. What are pond scum?

(i) algae
(ii) protozoa
(iii) fungi
(iv) bacteria

(i) algae

Q28. The disease caused by fungi is

(i) measles
(ii) chicken pox
(iii) polio
(iv) ringworm

(iv) ringworm

Q29. Amoeba belongs to

(i) Protozoa
(ii) Algae
(iii) Fungi
(iv) Virus

(i) Protozoa

Q30. Microorganisms are never found in a :

(i) ice cold water
(ii) hot water spring
(iii) marine water
(iv) none of the above

(iv) none of the above

Q31. Hepatitis-A is transmitted through:

(i) water
(ii) air
(iii) food
(iv) contact

(i) water

Q32. Common cold is caused by which type of microbe?

(i) Bacteria
(ii) Virus
(iii) Algae
(iv) Fungi

(ii) Virus

Q33. Which of the following is the smallest microorganism?

(i) Algae
(ii) Bacterium
(iii) Protozoan
(iv) Virus

(iv) Virus

Q34. Which of the following is not used as food preservatives?

(i) Salt
(ii) Sugar
(iii) Vinegar
(iv) Methane

(iv) Methane

Q35. A plant disease called citrus canker is caused by a

(i) Virus
(ii) Protozoa
(iii) Bacteria
(iv) Fungi

(iii) Bacteria

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