CBSE Class 12th Biology Chapter 10 - Microbes in Human Welfare Important Questions with Answers

You should focus on solving CBSE Class 12th Biology Chapter 10: Microbes in Human Welfare important questions, especially to help you score high marks. By solving CBSE Class 12th Biology 10 questions, you will be solving exam-oriented questions only.

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CBSE Class 12th Biology Chapter 10 - Microbes in Human Welfare is included in Unit 8 of the syllabus. Unit-VIII: Biology and Human Welfare consists of two chapters, namely Human Health and Diseases and Microbes in Human Welfare. Chapter 10 consists of the following topics: Microbes in food processing, industrial production, sewage treatment, energy generation, and microbes as bio-control agents and bio-fertilizers. Antibiotics: production and judicious use. The weightage for Unit 8 is 8 marks, which is divided into two parts for the two chapters included in the unit. Each chapter will carry at least 4 marks. The theory paper in Biology will be conducted for 70 marks. A 30-mark practical will be conducted in Biology, which will include experiments from the different units included in the syllabus.

There will be different types of questions included in the board question paper according to the latest changes made by CBSE. Questions based on Demonstrate Knowledge and Understanding will account for 50%, Application of Knowledge / Concepts for 30%, and Analyse, Evaluate, and Create for 20%. The question paper will be a mix of MCQs, very short answer type questions, short answer type questions, passage-based questions, cartoon-based questions, and long answer type questions. Make sure to download the latest curriculum PDF uploaded on the official website of CBSE Academics to understand the syllabus in detail.

The following books are prescribed by CBSE to study the syllabus: Biology, Class-XII, published by NCERT, Other related books and manuals brought out by NCERT (consider multimedia also), and Biology Supplementary Material (Revised), which is available on the CBSE website. You can take mock tests available on the Internet to test your preparation level after completing your curriculum. Do not forget to actively practice the diagrams included in the syllabus to achieve excellent marks during the board exams. Make a neatly labeled diagram wherever necessary to score full marks in that following question.

The Central Board of Secondary Education has already released the class 12th date sheet, according to which the class 12th exams will commence on 15th February 2025. Given below, we have shared some CBSE Class 12th Biology Chapter 10 - Microbes in Human Welfare Important Questions with Answers for the revision of the students. Attempt these questions, and do not forget to check the accurate answers by clicking on the appropriate tab.

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What are ‘floes’, formed during secondary treatment of sewage ? (Delhi 2019)

Question 2.

Write any two places yhere methanogens can be found. (Delhi 2019)

Question 3.

How does the activity of each one of the following help in organic farming? (Delhi 2019)
(i) Mycorrhiza
(ii) Cyanobacteria
(iii) Rhizobium

Question 4.

Name the genus to which baculoviruses belong. Describe their role in the integrated pest management programmes. (All India 2019)
Or
Baculoviruses are good example of biocontrol agents. Justify giving three reasons. (2018C)

Question 5.

The three microbes are listed below. Name the product produced by each one of them and mention their use. (2018C)
(i) Aspergillus niger
(ii) Trichoderma polysporum
(iii) Monascus purpureus

Question 6.

Your advice is sought to improve the nitrogen content of the soil to be used for cultivation of a non-leguminous terrestrial crop.
(i) Recommend two microbes that can enrich the soil with nitrogen.
(ii) Why do leguminous crops require such enrichment of the soil ? (2018)

Question 7.

Secondary treatment of the sewage is also called biological treatment. Justify this statement and explain the process. (All India 2017)

Question 8.

Describe how do ‘floes’ and ‘activated sludge’ help in sewage treatment. (Delhi 2017)

Question 9.

How does the application of the fungal genus, Glomus, to the agricultural farm increase the farm output? (Delhi 2017)

Question 10.

How does the application of cyanobacteria help to improve agricultural output? (Delhi 2017)

Question 1.

Distinguish between the roles of flocks and anaerobic sludge digesters in sewage treatments. (Delhi 2016)

Question 2.

List the events that reduce the Biological Oxygen Demand (BOD) of a primary effluent during sewage treatment. (Delhi 2016)

Question 3.

Make a list of three household products along with the names of the microorganisms producing them. (All India 2016)

Question 4.

List the events that reduce the Biological Oxygen Demand (BOD) of a primary effluent during sewage treatment. (Delhi 2016)

Question 5.

List the events that lead to biogas production from waste water whose BOD has been reduced significantly. (Delhi 2016)
Or
Explain the process of secondary treatment given to the primary effluent up to the point it shows significant change in the level of Biological Oxygen Demand (BOD) in it. (All India 2015)
Or
Explain, the process of sewage water treatment before it can be discharged into natural water bodies. Why is this treatment essential? (All india 2014)

Question 6.

Name a genus of baculovirus. Why are they considered good biocontrol agents? (All India 2016)

Question 7.

Why do we add an inoculum of curd to milk for curdling it? (Delhi 2015C)
Or
Why is ‘starter’ added to set the milk into curd? Explain. (All India 2014C)
Or
Name the nutrient that gets enhanced while curdling of milk by Lactobacillus? (All India 2014C)