NCERT Class 12 Biology Chapter 8 Microbes in Human Welfare MCQs & PYQ

In NCERT Class 12 Biology Chapter 8, titled "Microbes in Human Welfare," students explore the beneficial role of microbes in various human activities. The chapter discusses the use of microbes in food production, bioremediation, and medicine. Topics like the role of microbes in the nitrogen cycle, sewage treatment, and the production of antibiotics are covered. Students also learn about the concept of bio-fertilizers and the use of microorganisms in the production of industrial chemicals and enzymes. This chapter provides a deeper understanding of how microorganisms contribute to the welfare of humans and the environment.

This article provides a comprehensive resource for exam preparation. It includes sample MCQs and subjective questions for CBSE and CUET, alongside downloadable PDFs of Class 12 Biology Chapter 8 MCQs and previous year questions for detailed practice of NCERT Class 12 Microbes in Human Welfare.

NCERT Class 12 Biology Chapters
Chapter 1: Sexual Reproduction in Flowering Plants	Chapter 2: Human Reproduction
Chapter 3: Reproductive Health	Chapter 4: Principles of Inheritance and Variation
Chapter 5: Molecular Basis of Inheritance	Chapter 6: Evolution
Chapter 7: Human Health and Disease	Chapter 9: Biotechnology: Principles and Processes
Chapter 10: Biotechnology and its Applications	Chapter 11: Organisms and Populations
Chapter 12: Ecosystem	Chapter 13: Biodiversity and Conservation

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Class 12 Biology Chapter 8 MCQs

This question bank includes previous years' CUET and CBSE MCQs, along with questions curated by subject experts. Below are 5 sample multiple-choice questions (MCQs) for Class 12 Biology Chapter 8: Microbes in Human Welfare. For the full set of 50 questions, download the PDF using the link provided below.

The puffed up appearance of dough is due to the production of:

(a) Oxygen gas (b) CO₂ gas (c) Ethyl alcohol (d) Pyruvic acid

The large holes in ‘Swiss Cheese’ are due to:

(a) Production of large amount of O₂. (b) Citric acid.

The large holes in ‘Swiss cheese’ are due to–

(a) Production of a large amount of carbon dioxide by a bacterium

(b) A machine

(d) A fungus that release a lot of gases during its metabolic activities

Microbe responsible for converting milk to curd is:

(a) Saccharomyces cerevisiae (b) Lactobacillus

Match List – I with List – II.

LIST – I	LIST – II
A. Curd	I. Streptococcus
B. Butyric Acid	II. Propionibacterium sharmanii
C. Swiss Cheese	III. Clostridium butylicum
D. Clot buster	IV. Lactobacillus

Choose the correct answer from the options given below:

(a) A – I, B– II, C – III, D – IV (b) A – IV, B – III, C – II, D – I

Class 12 Biology Chapter 8 Subjective Questions Without Solutions

This question bank includes previous years' CBSE subjective questions (2 marks and above) without solutions, along with expert-curated questions. Below are 5 sample subjective questions for Class 12 Biology Chapter 8: Microbes in Human Welfare. To access all questions, download the PDF from the link provided below.

1.	“Curd is easier to digest by humans than milk.” Justify, giving two suitable reasons. (CBSE 2022, 2M)
2.	Lactic Acid Bacteria (LAB) sets milk into curd and also plays a very beneficial role for human health. Give any two suitable reasons. (CBSE 2022, 2M)
3.	Explain the changes that milk undergoes when suitable starter/inoculum is added to it. How does the end product formed prove to be beneficial for human health? (CBSE 2020, 3M)
4.	Name the group of bacteria involved in setting milk into curd. Explain the process they carry in doing so. Write another beneficial role of such bacteria. (CBSE 2019, 3M)
5.	(a) Why should antibiotics not be taken indiscriminately? Give any two reasons. (b) It is advisable to complete the course of antibiotics as prescribed by the doctor. Justify. (CBSE 2023, 2M)

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Science Subjects Table

Sub Areas of Chapter 8: Microbes in Human Welfare

Chapter Name	Sub Topics
Microbes in Human Welfare	8.1 Introduction
	8.2 Microorganisms in Food Production
	8.3 Microorganisms in Bioremediation
	8.4 Nitrogen Fixation by Microorganisms
	8.5 Microorganisms in Medicine
	8.6 Biofertilizers and their Role
	8.7 Industrial Uses of Microorganisms
	8.8 Microbial Action in Sewage Treatment

Review of NCERT Class 12 Biology Chapter 8

In NCERT Class 12 Biology Chapter 8, "Microbes in Human Welfare," students learn about the beneficial roles of microorganisms in various human activities. The chapter covers a wide range of topics, including the use of microbes in food production, bioremediation, and medicine. It explains how microorganisms contribute to the nitrogen cycle, treat sewage, and produce important substances like antibiotics and biofertilizers. The chapter also highlights how microbes are harnessed for industrial and environmental purposes.

By practicing MCQs and subjective questions, students can strengthen their understanding of the critical roles that microorganisms play in the welfare of humans and the environment. Mastery of this chapter is key to understanding the practical applications of microbiology in health, agriculture, and industry.

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