Class 8 Science Chapter 2 MCQ: Enhance your comprehension of Class 8 Science with our comprehensive CBSE Class 8 Science Chapter 2 MCQ. This chapter focuses on the crucial aspects of plant nutrition, exploring how plants absorb and utilize essential nutrients. Our detailed set of microorganisms MCQs, with answers, helps students master these concepts and excel academically.
Explore our extensive collection of CBSE Class 8 Science Chapter 2 MCQs, focusing on the fascinating realm of microorganisms. This chapter delves into the diverse types of microorganisms, including bacteria, fungi, viruses, and algae, highlighting their unique features and vital functions in the environment. From aiding in decomposition and nitrogen fixation to playing essential roles in nutrient cycling, these microorganisms are indispensable. Additionally, discover their significant contributions to agriculture, food processing, and medical fields. Each Class 8 MCQ is carefully crafted to align with the CBSE syllabus, providing thorough preparation and enhancing your understanding. Improve your academic performance with our MCQs and NCERT solutions for Class 8 Science.
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Science Chapter 2 Microorganisms Class 8 MCQ with Answers
1. What is the primary role of microorganisms in the nitrogen cycle?
a) Breaking down dead organisms
b) Fixing atmospheric nitrogen into soil
c) Producing oxygen
d) Photosynthesis
Answer: b) Fixing atmospheric nitrogen into soil
2. Which microorganism is used in the production of antibiotics?
a) Bacteria
b) Fungi
c) Viruses
d) Algae
Answer: b) Fungi
3. Which type of microorganism is commonly used in the production of bread?
a) Bacteria
b) Yeast
c) Viruses
d) Protozoa
Answer: b) Yeast
4. What is the shape of bacteria known as “cocci”?
a) Rod-shaped
b) Spiral-shaped
c) Spherical
d) Thread-like
Answer: c) Spherical
5. Which of the following is a beneficial microorganism found in the human gut?
a) Pathogenic bacteria
b) Antibiotic-resistant bacteria
c) Lactobacillus
d) Mycobacterium
Answer: c) Lactobacillus
6. What is the term used for microorganisms that cause diseases?
a) Probiotics
b) Pathogens
c) Symbionts
d) Decomposers
Answer: b) Pathogens
7. How do microorganisms contribute to the process of decomposition?
a) By producing toxins
b) By breaking down organic matter
c) By forming spores
d) By consuming oxygen
Answer: b) By breaking down organic matter
8. Which of the following is not a characteristic of viruses?
a) Can be seen under a light microscope
b) Require a host cell to reproduce
c) Can cause diseases
d) Consist of DNA or RNA surrounded by a protein coat
Answer: a) Can be seen under a light microscope
9. Which microorganism is known for its role in nitrogen fixation in the soil?
a) Rhizobium
b) Penicillium
c) Aspergillus
d) Saccharomyces
Answer: a) Rhizobium
10. What is the common name for the microorganism used in the fermentation of dairy products?
a) Mold
b) Yeast
c) Bacteria
d) Algae
Answer: c) Bacteria
11. Which type of microorganism can survive in extreme environments such as hot springs?
a) Bacteria
b) Viruses
c) Protozoa
d) Archaea
Answer: d) Archaea
12. What is the main method of reproduction for bacteria?
a) Binary fission
b) Budding
c) Spore formation
d) Sexual reproduction
Answer: a) Binary fission
13. What type of microorganism is used to make antibiotics such as penicillin?
a) Virus
b) Bacteria
c) Algae
d) Fungus
Answer: d) Fungus
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14. Which microorganism is commonly used in the fermentation of alcohol?
a) Bacteria
b) Protozoa
c) Yeast
d) Viruses
Answer: c) Yeast
15. What is the primary habitat of microorganisms in the soil?
a) Dry areas
b) Moist areas
c) High-temperature regions
d) Cold regions
Answer: b) Moist areas
16. Which microorganism is responsible for the spoilage of food products like bread?
a) Algae
b) Bacteria
c) Yeast
d) Protozoa
Answer: b) Bacteria
17. Which microorganism is used in the production of vinegar?
a) Yeast
b) Bacteria
c) Virus
d) Protozoa
Answer: b) Bacteria
18. What is the name of the process by which microorganisms convert sugars into acids, gases, or alcohol?
a) Photosynthesis
b) Respiration
c) Fermentation
d) Decomposition
Answer: c) Fermentation
19. Which microorganism is commonly used in the production of yogurt?
a) Virus
b) Yeast
c) Bacteria
d) Algae
Answer: c) Bacteria
20. What is the role of microorganisms in the nitrogen cycle?
a) Producing oxygen
b) Breaking down dead organisms
c) Fixing nitrogen into the soil
d) Pollinating plants
Answer: c) Fixing nitrogen into the soil
21. What is the primary food source for bacteria in compost?
a) Metal scraps
b) Organic matter
c) Plastic waste
d) Inorganic chemicals
Answer: b) Organic matter
22. Which microorganism is used in the process of bioremediation?
a) Fungi
b) Protozoa
c) Viruses
d) Algae
Answer: a) Fungi
23. Which microorganism is responsible for causing malaria?
a) Bacteria
b) Fungi
c) Protozoa
d) Virus
Answer: c) Protozoa
24. What is the primary role of microorganisms in the digestive system of ruminants like cows?
a) Producing vitamins
b) Breaking down cellulose
c) Absorbing nutrients
d) Producing toxins
Answer: b) Breaking down cellulose
25. Which microorganism is used in the production of sourdough bread?
a) Bacteria
b) Yeast
c) Virus
d) Algae
Answer: a) Bacteria
26. What is the main method used to control bacterial growth in food preservation?
a) Freezing
b) Boiling
c) Drying
d) All of the above
Answer: d) All of the above
27. Which microorganism is responsible for the fermentation of cocoa beans into chocolate?
a) Yeast
b) Bacteria
c) Mold
d) Protozoa
Answer: c) Mold
28. What is the structure that protects a bacterial cell from environmental damage?
a) Cell wall
b) Plasma membrane
c) Cytoplasm
d) Nucleus
Answer: a) Cell wall
29. Which microorganism is responsible for causing the common cold?
a) Bacteria
b) Virus
c) Fungus
d) Protozoa
Answer: b) Virus
30. What is the primary role of fungi in an ecosystem?
a) Producing oxygen
b) Decomposing organic matter
c) Fixing nitrogen
d) Pollinating plants
Answer: b) Decomposing organic matter
31. Which type of microorganism is used in the production of cheese?
a) Algae
b) Bacteria
c) Yeast
d) Protozoa
Answer: b) Bacteria
32. What is the term for a microorganism that can live in both aerobic and anaerobic conditions?
a) Aerobe
b) Anaerobe
c) Facultative anaerobe
d) Obligate anaerobe
Answer: c) Facultative anaerobe
33. Which microorganism is used in the production of biofuels?
a) Bacteria
b) Yeast
c) Algae
d) Virus
Answer: c) Algae
34. What is the function of spores in fungi?
a) Reproduction
b) Protection
c) Nutrient absorption
d) Respiration
Answer: a) Reproduction
35. Which microorganism is involved in the nitrogen fixation process in leguminous plants?
a) Rhizobium
b) Aspergillus
c) Saccharomyces
d) Penicillium
Answer: a) Rhizobium
36. What is the primary use of microorganisms in the wastewater treatment process?
a) To produce biogas
b) To decompose organic waste
c) To remove toxins
d) To filter water
Answer: b) To decompose organic waste
37. Which microorganism is used in the production of citric acid?
a) Bacteria
b) Yeast
c) Fungi
d) Protozoa
Answer: c) Fungi
38. What is the primary role of microorganisms in the ecosystem of a compost pile?
a) Breaking down complex organic materials
b) Producing toxins
c) Providing oxygen
d) Generating heat
Answer: a) Breaking down complex organic materials
39. What is the primary benefit of microorganisms in agriculture?
a) Producing antibiotics
b) Improving soil fertility
c) Causing plant diseases
d) Contaminating water
Answer: b) Improving soil fertility
40. Which type of microorganism is used in the production of sauerkraut?
a) Bacteria
b) Yeast
c) Mold
d) Virus
Answer: a) Bacteria
41. What is the role of microorganisms in the human digestive system?
a) Producing vitamins
b) Breaking down food
c) Absorbing nutrients
d) All of the above
Answer: d) All of the above
42. Which microorganism is involved in the production of antibiotics like streptomycin?
a) Bacteria
b) Fungi
c) Algae
d) Protozoa
Answer: b) Fungi
43. What is the primary structure of a bacterial cell that helps in its movement?
a) Cilia
b) Flagella
c) Pseudopodia
d) Fimbriae
Answer: b) Flagella
44. Which microorganism is known for causing food poisoning through the production of toxins?
a) Lactobacillus
b) Escherichia coli
c) Streptococcus
d) Saccharomyces cerevisiae
Answer: b) Escherichia coli
45. What is the function of bacterial plasmids?
a) DNA replication
b) Protein synthesis
c) Genetic variation
d) Nutrient absorption
Answer: c) Genetic variation
46. Which microorganism is used to treat wastewater by breaking down organic pollutants?
a) Yeast
b) Bacteria
c) Algae
d) Viruses
Answer: b) Bacteria
47. What is the term for microorganisms that live in extreme heat?
a) Psychrophiles
b) Mesophiles
c) Thermophiles
d) Halophiles
Answer: c) Thermophiles
48. Which microorganism is used in the production of soy sauce?
a) Bacteria
b) Yeast
c) Mold
d) Virus
Answer: c) Mold
49. What is the role of microorganisms in the carbon cycle?
a) Producing methane
b) Decomposing organic matter
c) Fixing carbon dioxide
d) Producing oxygen
Answer: b) Decomposing organic matter
50. Which microorganism is commonly used to test water quality?
a) Yeast
b) Bacteria
c) Fungi
d) Algae
Answer: b) Bacteria
