NCERT MCQ Solutions for Class 8 Science Chapter 2 Microorganisms: Friend and Foe Revised for Session 2025-26. These questions provide accurate answers to all important multiple choice questions based on the latest syllabus. These MCQs cover key topics like types of microorganisms, their uses, harmful effects and prevention methods. Designed for easy understanding, these solutions help students revise quickly and score well in exams. Ideal for concept clarity and practice, especially in competitive assessments and school tests.
Class 8 Science Chapter 2 Solution
Class 8 Science MCQ
Class 8 All Subjects MCQ
Class 8 Science Chapter 2 MCQ Online Test
Q1. Which of the following microorganisms is responsible for converting milk into curd?
[A]. Rhizobium
[B]. Lactobacillus
[C]. Penicillium
[D]. Yeast
Q2. What is the process of conversion of sugar into alcohol called?
[A]. Fermentation
[B]. Pasteurisation
[C]. Vaccination
[D]. Nitrogen fixation
Q3. Which of the following diseases is caused by a virus?
[A]. Cholera
[B]. Common cold
[C]. Typhoid
[D]. Tuberculosis
Q4. What is the role of Rhizobium in leguminous plants?
[A]. Fixes nitrogen
[B]. Spoils food
[C]. Produces antibiotics
[D]. Causes diseases
Class 8 Science Chapter 2 Quiz
Q5. Which of the following is a preservative used in jams and squashes?
[A]. Lactobacillus
[B]. Yeast
[C]. Rhizobium
[D]. Sodium benzoate
Q6. What is the primary cause of malaria?
[A]. Virus
[B]. Fungus
[C]. Protozoa
[D]. Bacteria
Q7. Which of the following is used in the production of bread and cakes?
[A]. Yeast
[B]. Virus
[C]. Protozoa
[D]. Bacteria
Q8. What is the purpose of pasteurisation?
[A]. To kill harmful microbes in milk
[B]. To ferment sugar
[C]. To fix nitrogen
[D]. To increase nitrogen content
Class 8 Science Chapter 2 Quiz Questions
Q9. Which of the following is a communicable disease?
[A]. Cancer
[B]. Cholera
[C]. Hypertension
[D]. Diabetes
Q10. What is the function of antibiotics?
[A]. To ferment food
[B]. To preserve food
[C]. To kill or stop the growth of disease-causing microorganisms
[D]. To increase soil fertility
Q11. Which microorganism is used to make antibiotics like penicillin?
[A]. Protozoa
[B]. Virus
[C]. Fungus
[D]. Bacteria
Q12. What is the main carrier of dengue virus?
[A]. Female Aedes mosquito
[B]. Female Anopheles mosquito
[C]. Cockroach
[D]. Housefly
Class 8 Science Chapter 2 MCQ Exercises
Q13. Which of the following is a method of food preservation?
[A]. Nitrogen fixation
[B]. Vaccination
[C]. Use of salt or sugar
[D]. Fermentation
Q14. What is the primary component of the nitrogen cycle?
[A]. Production of alcohol
[B]. Spoilage of food
[C]. Spread of diseases
[D]. Conversion of nitrogen gas into usable compounds
Q15. Which of the following is a harmful effect of microorganisms?
[A]. Causing food poisoning
[B]. Producing antibiotics
[C]. Making curd
[D]. Fixing nitrogen
Q16. What is the primary source of antibiotics?
[A]. Bacteria and fungi
[B]. Protozoa
[C]. Algae
[D]. Viruses
Class 8 Science Chapter 2 MCQ for Exams
Q17. Which of the following is a viral disease?
[A]. Tuberculosis
[B]. Cholera
[C]. Polio
[D]. Typhoid
Q18. What is the purpose of vaccination?
[A]. To fix nitrogen
[B]. To provide immunity against diseases
[C]. To ferment milk
[D]. To spoil food
Q19. Which of the following microorganisms is used in cleaning the environment?
[A]. Virus
[B]. Bacteria
[C]. Protozoa
[D]. Yeast
Q20. What is the main reason for keeping food in airtight containers?
[A]. To prevent microbial attack
[B]. To enhance fermentation
[C]. To fix nitrogen
[D]. To increase nitrogen content
