Microbes in human welfare class 12 MCQ Question and Answer

Microbes in human welfare class 12 chapter 10 MCQ Question and Answer

Microbes in human welfare class 12 MCQs these are 30 MCQs taken from NCERT book Microbes in human welfare class 12 MCQs these are prepared according to the latest Exam pattern Practising these Microbes in human welfare class 12 MCQs really effective to Improve your understanding level

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Microbes in human welfare class 12 MCQs

Question:1 Which microorganism is used in the production of antibiotics?

1. a) Bacteriophage
2. b) Algae
3. c) Bacteria
4. d) Fungi

Question:2 Which enzyme is produced by microorganisms to convert milk into curd?

1. a) Trypsin
2. b) Pepsin
3. c) Lactase
4. d) Lactase

Question:3 The microorganism responsible for the conversion of alcohol into acetic acid is

1. a) Saccharomyces cerevisiae
2. b) Lactobacillus
3. c) Rhizobium
4. d) Streptococcus

Question:4 Nitrogen-fixing bacteria that form a symbiotic association with leguminous plants are known as

1. a) Azotobacter
2. b) Clostridium
3. c) Rhizobium
4. d) Mycorrhiza

Question:5 The bacterium used in the production of the bioinsecticide Bt toxin is

1. a) Escherichia coli
2. b) Bacillus thuringiensis
3. c) Clostridium botulinum
4. d) Streptococcus

Question:6 Which microorganism is responsible for the fermentation of idli and dosa batter?

1. a) Lactobacillus
2. b) Saccharomyces cerevisiae
3. c) Escherichia coli
4. d) Clostridium

Question:7 Biogas is primarily composed of

1. a) Methane and carbon dioxide
2. b) Oxygen and nitrogen
3. c) Carbon dioxide and hydrogen
4. d) Methane and hydrogen

Question:8 The microorganism responsible for the production of cyclosporin, an immunosuppressive drug, is

1. a) Streptomyces
2. b) Escherichia coli
3. c) Saccharomyces cerevisiae
4. d) Lactobacillus

Question:9 Which enzyme produced by bacteria is used in the removal of oil stains from clothes?

1. a) Amylase
2. b) Protease
3. c) Lipase
4. d) Cellulase

Question:10 The process of using microorganisms to clean up an oil spill is called

1. a) Fermentation
2. b) Biogas production
3. c) Bioremediation
4. d) Pasteurization

Question:11 Penicillin, the first antibiotic discovered, is produced by which microorganism?

1. a) Escherichia coli
2. b) Streptococcus
3. c) Penicillium
4. d) Clostridium

Question:12 Which microorganism is used for retting of jute fibers?

1. a) Bacteriophage
2. b) Bacillus
3. c) Clostridium
4. d) Mycorrhiza

Question:13 Microbes used in the treatment of sewage and organic waste are

1. a) Pathogenic
2. b) Beneficial
3. c) Parasitic
4. d) Non-pathogenic

Question:14 Which of the following is not a product of microbial fermentation?

1. a) Alcohol
2. b) Vinegar
3. c) Soap
4. d) Bread

Question:15 The process of conversion of organic matter into biogas is called

1. a) Composting
2. b) Fermentation
3. c) Digestion
4. d) Bioremediation

Question:16 What type of bacteria are used in the sewage treatment process to break down organic matter?

1. a) Nitrogen-fixing bacteria
2. b) Nitrifying bacteria
3. c) Denitrifying bacteria
4. d) Decomposers

Question:17 The microorganism used in the treatment of wastewater to remove organic pollutants is

1. a) Algae
2. b) Fungi
3. c) Protozoa
4. d) Bacteria

Question:18 Which microorganism is used to produce single-cell protein (SCP)?

1. a) Rhizobium
2. b) Spirulina
3. c) Saccharomyces cerevisiae
4. d) Escherichia coli

Question:19 The process of using microorganisms to degrade or clean up pollutants in the environment is known as

1. a) Fermentation
2. b) Sterilization
3. c) Bioremediation
4. d) Pasteurization

Question:20 The microbial process used to improve the nutritional value of animal feed is called

1. a) Fermentation
2. b) Composting
3. c) Pasteurization
4. d) Fortification

Microbes in human welfare class 12 very toughand Important MCQs Exam level

Question:21 Which microorganism is responsible for the production of the antibiotic Streptomycin, used in the treatment of tuberculosis?

1. a) Escherichia coli
2. b) Penicillium
3. c) Streptomyces
4. d) Lactobacillus

Question:22 What is the primary role of Mycorrhiza in plants?

1. a) Nitrogen fixation
2. b) Protection against pathogens
3. c) Enhancement of mineral absorption
4. d) Photosynthesis

Question:23 In the process of bioremediation, which group of microorganisms is primarily responsible for the degradation of organic pollutants in contaminated environments?

1. a) Archaea
2. b) Bacteriophages
3. c) Methanogens
4. d) Hydrocarbon-degrading bacteria

Question:24 Which microorganism is used in the commercial production of single-cell protein (SCP), a protein-rich food source?

1. a) Clostridium
2. b) Saccharomyces cerevisiae
3. c) Rhizobium
4. d) Spirulina

Question:25 The enzyme used in molecular biology techniques, such as DNA amplification through PCR (Polymerase Chain Reaction), is derived from which thermophilic microorganism?

1. a) Escherichia coli
2. b) Bacillus
3. c) Thermus aquaticus
4. d) Clostridium botulinum

Question:26 Which type of bacteria are used in sewage treatment to convert ammonia into nitrates and nitrites?

1. a) Denitrifying bacteria
2. b) Nitrogen-fixing bacteria
3. c) Nitrifying bacteria
4. d) Sulfur bacteria

Question:27 The microorganism responsible for the production of the antibiotic Cephalosporin is

1. a) Penicillium
2. b) Streptomyces
3. c) Escherichia coli
4. d) Lactobacillus

Question:28 Which microorganism is involved in the process of “composting” to convert organic waste into nutrient-rich humus?

1. a) Methanogens
2. b) Protozoa
3. c) Decomposers
4. d) Cyanobacteria

Question:29 Microbial fuel cells use microorganisms to

1. a) Produce electricity
2. b) Generate heat
3. c) Filter water
4. d) Create biofuels

Question:30 The bacteria used in the treatment of wastewater to remove phosphorus from effluents and prevent water pollution are called

1. a) Nitrogen-fixing bacteria
2. b) Phosphate-solubilizing bacteria
3. c) Sulfur bacteria
4. d) Hydrocarbon-degrading bacteria

MCQs Answers

Question No	Answer	Question No	Answer
1	D	16	D
2	C	17	D
3	A	18	B
4	C	19	C
5	B	20	A
6	A	21	C
7	A	22	C
8	A	23	D
9	C	24	D
10	C	25	C
11	C	26	C
12	B	27	B
13	B	28	C
14	C	29	A
15	C	30	B

Microbes in human welfare class 12 Five important Question and Answer

Question:1 How do microorganisms contribute to the production of antibiotics?

1. Answer: Microorganisms like bacteria and fungi, such as Penicillium, produce antibiotics naturally. These antibiotics are then isolated and used in medicine to combat bacterial infections. For example, penicillin, derived from Penicillium, is a widely used antibiotic.

Question: What role do nitrogen-fixing bacteria play in agriculture, and how do they benefit crop growth?

1. Answer: Nitrogen-fixing bacteria, such as Rhizobium, form symbiotic associations with leguminous plants and convert atmospheric nitrogen into a usable form for plants. This enriches the soil with nitrogen, promoting healthier plant growth and reducing the need for synthetic fertilizers.

Question: How are microorganisms used in the production of biogas, and what is the significance of biogas as a renewable energy source?

1. Answer: Microorganisms in anaerobic digesters break down organic waste (e.g., animal dung, sewage) to produce biogas, which mainly consists of methane. Biogas is a clean and renewable energy source used for cooking and electricity generation, reducing the reliance on fossil fuels and promoting sustainable energy practices.

Question: Explain the process of curd formation using microorganisms. How do lactic acid bacteria contribute to this process?

1. Answer: Curd formation involves the fermentation of milk by lactic acid bacteria, such as Lactobacillus. These bacteria convert lactose (milk sugar) into lactic acid, which curdles the milk and gives curd its texture and taste. Lactic acid bacteria also impart health benefits to curd.

Question: What is bioremediation, and how do microorganisms assist in the cleanup of polluted environments?

1. Answer: Bioremediation is the use of microorganisms to degrade or neutralize pollutants in contaminated environments. Certain microorganisms, like hydrocarbon-degrading bacteria, can break down and detoxify oil spills and other organic pollutants, contributing to environmental cleanup efforts.

Read also

1. Chapter 1: Reproduction in Organisms class 12 MCQ
2. Chapter 2: Sexual Reproduction Flowering plants class 12 MCQ
3. Chapter 3: Human Reproduction class 12 MCQ
4. Chapter 4: Reproductive Health class 12 MCQ
5. Chapter 5: Principles of Inheritance and Variation class 12 MCQ

Conclusion

In conclusion, the study of “Microbes in Human Welfare” reveals the diverse and vital roles that microorganisms play in fields ranging from medicine to agriculture and environmental management. Understanding their applications is crucial for harnessing their potential in improving human life and the environment.