MCQ questions for class 8 Science Chapter 2 Microorganisms: Friend and Foe
Question 1: What is the term for microorganisms that cause diseases?
Probiotics
Pathogens
Antibiotics
Decomposers
Question 2: Which of the following is a beneficial role of microorganisms?
Causing diseases
Decomposing dead matter
Inducing spoilage
Producing pollution
Question 3: What is the term for the process of conversion of sugar into alcohol by microorganisms?
Fermentation
Photosynthesis
Respiration
Transpiration
Question 4: Which of the following microorganisms is used in the production of antibiotics?
Bacteria
Fungi
Protozoa
Virus
Question 5: What is the term for microorganisms that live in the root nodules of leguminous plants and fix atmospheric nitrogen?
Nitrobacters
Rhizobium
Mycorrhiza
Azotobacter
Question 6: Which of the following microorganisms is used in the production of curd?
Yeast
Lactobacillus
Penicillium
Rhizobium
Question 7: What is the term for the process of conversion of milk into curd by the action of microorganisms?
Fermentation
Pasteurization
Curding
Curdling
Question 8: Which of the following microorganisms is responsible for the formation of curd from milk?
Yeast
Lactobacillus
Penicillium
Rhizobium
Question 9: What is the term for the microorganisms that help in the production of antibiotics?
Pathogens
Decomposers
Bacteria
Streptomyces
Question 10: Which of the following microorganisms causes diseases like common cold, influenza, and COVID-19?
Bacteria
Virus
Fungi
Protozoa
Question 11: What is the term for the process of converting complex organic substances into simpler compounds by microorganisms?
Fermentation
Decomposition
Photosynthesis
Transpiration
Question 12: Which of the following microorganisms is used in the making of bread?
Bacteria
Yeast
Mold
Protozoa
Question 13: What is the term for the microorganisms that decompose dead plants and animals?
Pathogens
Decomposers
Probiotics
Antibiotics
Question 14: Which of the following microorganisms is used in the production of alcohol?
Bacteria
Fungi
Protozoa
Virus
Question 15: What is the term for the microorganisms that cause diseases in plants?
Phytopathogens
Decomposers
Mycorrhiza
Nitrobacters
Question 16: Which of the following microorganisms is responsible for the disease malaria?
Bacteria
Virus
Fungi
Protozoa
Question 17: What is the term for microorganisms that are added to the soil to improve its fertility?
Decomposers
Pathogens
Mycorrhiza
Nitrobacters
Question 18: Which of the following microorganisms is used in the production of antibiotics?
Penicillium
Rhizobium
Mycorrhiza
Streptomyces
Question 19: What is the term for microorganisms that live in the intestines of animals and humans and help in digestion?
Pathogens
Decomposers
Probiotics
Antibiotics
Question 20: Which of the following microorganisms is used in the production of soy sauce and vinegar?
Bacteria
Fungi
Protozoa
Virus
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