Microbes in Human Welfare
105 CBSE Class 12 Biology past-year questions from 5 papers, 2022 to 2026, with answers and worked solutions.
- Difficulty: 86 easy · 13 moderate · 6 hard.
- Most-asked subtopics: Microbes in Industrial Products (30), Microbes in Sewage Treatment (21), Microbes as Biocontrol Agents (20).
- Updated 8 October 2026.
#1Microbes in Household Products
For Questions number 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.#2Microbes in Household Products
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#6Microbes in Household Products
#7Microbes in Household Products
For Questions number 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.#8Microbes in Household Products
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#20Microbes in Industrial Products
For Question numbers 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Answer these questions by selecting the appropriate option given below :#21Microbes in Industrial Products
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#39Microbes in Industrial Products
For Question numbers 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from Code (A), (B), (C) and (D) as given below :#40Microbes in Industrial Products
#41Microbes in Industrial Products
#42Microbes in Sewage Treatment
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#44Microbes in Sewage Treatment
For Questions number 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.#45Microbes in Sewage Treatment
Study the figure given below and answer the questions that follow.#46Microbes in Sewage Treatment
Study the figure given below and answer the questions that follow.#47Microbes in Sewage Treatment
Study the figure given below and answer the questions that follow.#48Microbes in Sewage Treatment
Study the figure given below and answer the questions that follow.#49Microbes in Sewage Treatment
#50Microbes in Sewage Treatment
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- Biotechnology and its Applications112
- Biotechnology: Principles and Processes158
- Ecosystem58
- Evolution93
- Human Health and Disease185
- Human Reproduction119
- Molecular Basis of Inheritance165
- Organisms and Populations87
- Principles of Inheritance and Variation167
- Reproductive Health62
- Sexual Reproduction in Flowering Plants119