MICROBES AND THEIR RELEVANCE TO HUMAN WELFARE Class 12 MCQS

Here Are 50 Multiple-Choice Questions (Mcqs) About

MICROBES AND THEIR RELEVANCE TO HUMAN WELFARE

Class 12
Indian Syllabus 2023



1. Which group of microbes is commonly used in the fermentation process for
making bread and alcoholic beverages?

a) Bacteria

b) Fungi

c) Viruses

d) Protozoa

**Answer: b) Fungi**



2. The process of converting milk into curd is mainly carried out by which type of
microorganism?

a) Bacteria

b) Fungi

c) Viruses

d) Algae

**Answer: a) Bacteria**



3. Which microbe is responsible for the production of antibiotics like penicillin?

, a) Escherichia coli

b) Saccharomyces cerevisiae

c) Streptomyces

d) Pseudomonas aeruginosa

**Answer: c) Streptomyces**



4. Nitrogen-fixation in leguminous plants is facilitated by which type of microbes?

a) Bacteria

b) Fungi

c) Algae

d) Protozoa

**Answer: a) Bacteria**



5. Which microbe is used to produce citric acid and other organic acids through
fermentation?

a) Lactobacillus

b) Saccharomyces

c) Acetobacter

d) Aspergillus niger

**Answer: d) Aspergillus niger**



6. Which microorganism is used in the biogas production process?

, a) Methanogens

b) Nitrogen-fixing bacteria

c) Cyanobacteria

d) Yeast

**Answer: a) Methanogens**



7. The disease 'Tuberculosis' is caused by which bacterium?

a) Escherichia coli

b) Streptococcus pyogenes

c) Mycobacterium tuberculosis

d) Salmonella typhi

**Answer: c) Mycobacterium tuberculosis**



8. Which microbe is used in the production of vaccines through the process of
attenuation?

a) Bacillus anthracis

b) Vibrio cholerae

c) Clostridium botulinum

d) Mycobacterium bovis

**Answer: d) Mycobacterium bovis**



9. Which microorganism is responsible for causing dental cavities?