Class 12 Biology MCQ Chapter 10 Microbes in Human Welfare Solutions English Medium to each chapter is provided in the list so that you can easily browse through different chapters Class 12 Biology MCQ Chapter 10 Microbes in Human Welfare Question Answer in English and select need one. AHSEC Class 12 Biology Objective Type Question Answer As Per AHSEC New Book Syllabus Download PDF. AHSEC Biology MCQ Class 12 Solutions.
Class 12 Biology MCQ Chapter 10 Microbes in Human Welfare
Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. AHSEC Class 12 Biology Multiple Choice Solutions in English Medium are part of All Subject Solutions. Here we have given AHSEC Class 12 Biology MCQ Question Answer English Medium for All Chapters, You can practice these here.
Microbes in Human Welfare
Chapter: 10
| MCQs |
Choose the Correct Option:
1. Which bacteria is responsible for curdling of milk?
(i) Lactobacillus.
(ii) Azotobacter.
(iii) Streptococcus.
(iv) Clostridium.
Ans: (i) Lactobacillus.
2. The vitamin content increased in curd is:
(i) Vitamin A.
(ii) Vitamin C.
(iii) Vitamin B₁₂.
(iv) Vitamin D.
Ans: (iii) Vitamin B₁₂.
3. Baker’s yeast used in bread making is:
(i) Candida albicans.
(ii) Rhizopus stolonifer.
(iii) Saccharomyces cerevisiae.
(iv) Aspergillus niger.
Ans: (iii) Saccharomyces cerevisiae.
4. Swiss cheese has big holes due to:
(i) Lactobacillus.
(ii) Acetobacter.
(iii) Propionibacterium sharmanii.
(iv) Clostridium butylicum.
Ans: (iii) Propionibacterium sharmanii.
5. Roquefort cheese is ripened by:
(i) Bacteria.
(ii) Yeast.
(iii) Fungi.
(iv) Viruses.
Ans: (iii) Fungi.
6. Toddy is a traditional drink made by fermenting sap of:
(i) Coconut.
(ii) Sugarcane.
(iii) Palm.
(iv) Banana.
Ans: (iii) Palm.
7. The first antibiotic discovered was:
(i) Streptomycin.
(ii) Penicillin.
(iii) Erythromycin.
(iv) Tetracycline.
Ans: (ii) Penicillin.
8. Antibiotics are produced by:
(i) Protozoans.
(ii) Fungi and bacteria.
(iii) Algae.
(iv) Viruses.
Ans: (ii) Fungi and bacteria.
9. Penicillium notatum is a type of:
(i) Bacterium.
(ii) Fungus.
(iii) Virus.
(iv) Algae.
Ans: (ii) Fungus.
10. Which bacterium is used in the commercial production of acetic acid?
(i) Lactobacillus.
(ii) Clostridium.
(iii) Acetobacter aceti.
(iv) Aspergillus.
Ans: (iii) Acetobacter aceti.
11. Citric acid is produced by:
(i) Aspergillus niger.
(ii) Lactobacillus.
(iii) Clostridium butylicum.
(iv) Streptococcus.
Ans: (i) Aspergillus niger.
12. Cyclosporin A is used as:
(i) Antibiotic.
(ii) Biofertiliser.
(iii) Clot buster.
(iv) Immunosuppressant.
Ans: (iv) Immunosuppressant.
13. Statins are used to:
(i) Lower blood pressure.
(ii) Reduce fever.
(iii) Kill worms.
(iv) Lower blood cholesterol.
Ans: (iv) Lower blood cholesterol.
14. Biogas is mainly composed of:
(i) Hydrogen.
(ii) Oxygen.
(iii) Methane.
(iv) Nitrogen.
Ans: (iii) Methane.
15. Methanogens are present in:
(i) Air.
(ii) Anaerobic sludge and cattle rumen.
(iii) Seawater.
(iv) Plant roots.
Ans: (ii) Anaerobic sludge and cattle rumen.
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