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NCERT solutions for Class 12 Biology chapter 10 - Microbes in Human Welfare

Biology Textbook for Class 12

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NCERT Biology Class 12

Biology Textbook for Class 12

Chapter 10 - Microbes in Human Welfare

Pages 189 - 190

Q 1 | Page 189

Bacteria cannot be seen with the naked eyes, but these can be seen with the help of a microscope. If you have to carry a sample from your home to your biology laboratory to demonstrate the presence of microbes under a microscope, which sample would you carry and why?

Q 2 | Page 189

Give examples to prove that microbes release gases during metabolism.

Q 3 | Page 189

In which food would you find lactic acid bacteria? Mention some of their useful applications.

Q 4 | Page 189

Name some traditional Indian foods made of wheat, rice and Bengal gram (or their products) which involve use of microbes.

Q 5 | Page 189

In which way have microbes played a major role in controlling diseases caused by harmful bacteria?

Q 6 | Page 189

Name any two species of fungus, which are used in the production of the antibiotics.

Q 7 | Page 189

What is sewage? In which way can sewage be harmful to us?

Q 8 | Page 189

What is the key difference between primary and secondary sewage treatment?

Q 9 | Page 189

Do you think microbes can also be used as source of energy? If yes, how?

Q 10 | Page 189

Microbes can be used to decrease the use of chemical fertilisers and pesticides. Explain how this can be accomplished.

Q 11 | Page 189

Three water samples namely river water, untreated sewage water and secondary effluent discharged from a sewage treatment plant were subjected to BOD test. The samples were labelled A, B and C; but the laboratory attendant did not note which was which. The BOD values of the three samples A, B and C were recorded as 20mg/L, 8mg/L and 400mg/L, respectively. Which sample of the water is most polluted? Can you assign the correct label to each assuming the river water is relatively clean?

Q 12 | Page 190

Find out the name of the microbes from which Cyclosporin A (an immunosuppressive drug) and Statins (blood cholesterol lowering agents) are obtained

Q 13.1 | Page 190

Find out the role of microbes in the following

Single cell protein (SCP)

Q 13.2 | Page 190

Find out the role of microbes in the following 


Q 14 | Page 190

Arrange the following in the decreasing order (most important first) of their importance, for the welfare of human society. Give reasons for your answer.

Biogas, Citric acid, Penicillin and Curd

Q 15 | Page 190

How do biofertilisers enrich the fertility of the soil?

NCERT Biology Class 12

Biology Textbook for Class 12

NCERT solutions for Class 12 Biology chapter 10 - Microbes in Human Welfare

NCERT solutions for Class 12 Biology chapter 10 (Microbes in Human Welfare) include all questions with solution and detail explanation from Biology Textbook for Class 12. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. has created the CBSE Biology Textbook for Class 12 solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Class 12 Biology chapter 10 Microbes in Human Welfare are Microbes in Household Products, Microbes in Industrial Production, Microbes in Sewage Treatment, Energy Generation, Microbes as Biocontrol Agents, Production and Judicious Use, Introduction of Microbes in Human Welfare, Microbes in Production of Biogas, Microbes in Human Welfare (Questions), Microbes as Biofertilisers.

Using NCERT solutions for Class 12 Biology by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in NCERT Solutions are important questions that can be asked in the final exam. Maximum students of CBSE Class 12 prefer NCERT Textbook Solutions to score more in exam.

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