Comments 0 Feedbacks on “Class 12 Microbes in Human Welfare MCQs with Answer”Class 12th Biology MCQs by rs.ritendra

Class 12 Microbes in Human Welfare MCQs with Answer

Class 12 Chemistry Microbes in Human Welfare MCQs with Answer

Class 12 Chemistry MCQs on “Microbes in Human Welfare” are meticulously curated to aid students in mastering this crucial topic. These multiple-choice questions cover a wide range of concepts, including the role of microbes in agriculture, medicine, food production, and environmental cleanup. Through practicing these MCQs, students can deepen their understanding of how microorganisms contribute to various aspects of human welfare.

Our MCQs challenge students to apply their knowledge of microbial processes and their applications in real-world scenarios, fostering critical thinking and problem-solving skills. Each question is accompanied by a detailed explanation, allowing students to grasp the underlying concepts thoroughly.

By engaging with our Class 12 Chemistry MCQs on “Microbes in Human Welfare” at Horizon Competition School, students not only prepare effectively for their exams but also develop a deeper appreciation for the significant role that microbes play in enhancing human welfare and sustainability.

Q1. The full potential of penicillin as an antibiotic was established by:

  1. Alexander Fleming.
  2. Chain and Florey.
  3. F. Sanger.
  4. Florey
Click To View The Answer

Ans: 2. Chain and Florey.

Click To View The Answer

Q3. The bacteria which helps in the fermentation of Swiss cheese is:

  1. Lactobacillus.
  2. Monascus.
  3. Rhizobium.
  4. Propionibacterium.
Click To View The Answer

Ans: 4. Propionibacterium.

Q4. The residue left after methane production from cattle dung is:

  1. Burnt.
  2. Burried in land fills.
  3. Used as manure.
  4. Used in civil construction.
Click To View The Answer

Ans: 3. Used as manure.

Thus gobar (excreta/ dung) of cattle is rich in these bacteria. Dung can be used for generation of biogas, commonly called gobar
gas

The residue left after methane production from cattle dung is used as manure.

Q5. Big holes in Swiss cheese are made by a:

  1. A machine.
  2. A bacterium that produces methane gas.
  3. A bacterium producing a large amount of carbon dioxide.
  4. A fungus that releases a lot of gases during its metabolic activities.
Click To View The Answer

Ans: 3. A bacterium producing a large amount of carbon dioxide.
A bacterium called Propionibacterium shermanii produces a large amount of carbon dioxide during fermentation. This is the reason of
big holes in Swiss cheese.

Q6. IPM programme is related with:

  1. Biofertilisers.
  2. Biocontrol agents.
  3. Organic farming.
  4. Biogas.
Click To View The Answer

Ans: 2. Biocontrol agents.

Click To View The Answer

Q8. BOD of waste water is estimated by measuring the amount of:

  1. Total organic matter.
  2. Biodegradable organic matter.
  3. Oxygen evolution.
  4. Oxygen consumption.
Click To View The Answer

Ans: 4. Oxygen consumption.
BOD stands for biochemical oxygen demand and is thus related to oxygen consumption.

Q9. Wastewater treatment generates a large quantity of sludge, which can be treated by:

  1. Digesters.
  2. Activated sludge.
  3. Chemicals.
  4. Oxidation pond.
Click To View The Answer

Ans: 1. Digesters.
Sludge needs to be subjected to biological treatment which is provided by anaerobic digesters

Q10. Propionibacterium produces large holes in swiss cheese due to the:

  1. Process of oxidation of the dough.
  2. Formation of large amount of CO2 .
  3. Consumption of carbohydrates.
  4. All of these.
Click To View The Answer

Ans: 2. Formation of large amount of CO2

Q11. The free-living fungus Trichoderma can be used for:

  1. Killing insects.
  2. Biological control of plant diseases.
  3. Controlling butterfly caterpillars.
  4. Producing antibiotics.
Click To View The Answer

Ans: 2. Biological control of plant diseases.
The free-living fungus Trichoderma can be used for biological control of plant diseases.

Q12. Which one is the most important role of micro organism for the wellbeing of humans?

  1. Sewage treatment.
  2. Production of methane.
  3. Biological control of plant disease.
  4. Conversion of milk to curd.
Click To View The Answer

Ans: 4. Conversion of milk to curd.

Conversion of milk to curd is the right treatment that plays an important role in the micro organism for the well being of humans. Milk
will be converted into curd or yogurt based on process of fermentation. Normally, Milk consists of the globular proteins known as
casein. Lactic acid bacteria and casein forms a chemical reaction forming curd.

Q13. Nitrogen fixation in root nodules of Alnus is brought about by:

  1. Frankia.
  2. Azospirillum.
  3. Nostoc.
  4. Rhizobium.
Click To View The Answer

Ans: 1. Frankia.

Q14. Which one of the following is not a nitrogen-fixing organism?

  1. Anabaena.
  2. Nostoc.
  3. Azotobacter.
  4. Pseudomonas.
Click To View The Answer

Ans: 4. Pseudomonas.
Most of the species of Pseudomonas are pathogens; causing diseases in plants and animals.

Q15. Which one of the following alcoholic drinks is produced without distillation?

  1. Wine.
  2. Whisky.
  3. Rum.
  4. Brandy.
Click To View The Answer

Ans: 1. Wine.
Wine and beer are produced, without distillation. Whisky, brandy and rum are produced by distillation.

FAQs

How do MCQs on “Microbes in Human Welfare” help Class 12 Chemistry students understand the practical applications of microbial processes?
  1. MCQs on “Microbes in Human Welfare” are designed to assess students’ understanding of the role of microorganisms in various aspects of human life, including agriculture, medicine, food production, and environmental management. These MCQs present students with real-life scenarios where microbial processes are applied, prompting them to analyze and apply their knowledge to solve problems. By engaging with these MCQs, students not only reinforce theoretical concepts but also gain insight into the practical applications of microbial processes, preparing them for real-world challenges in fields such as biotechnology and environmental science.
How can students effectively prepare for Class 12 Chemistry exams using MCQs on “Microbes in Human Welfare”?

To effectively prepare for Class 12 Chemistry exams using MCQs on “Microbes in Human Welfare,” students should first ensure a thorough understanding of the fundamental concepts related to microbial processes and their applications. They should then practice solving a variety of MCQs from reputable sources, focusing on topics such as microbial biofertilizers, antibiotics, fermented foods, and bioremediation. Students need to analyze both correct and incorrect answers to deepen their understanding of the subject and identify areas for improvement. Regular practice with MCQs, coupled with comprehensive revision of concepts, can significantly enhance students’ performance in Class 12 Chemistry exams