NCERT Class 12 Biology Chapter 8 Microbes in Human Welfare Test Mock Test
This free online test covers Chapter 8, Microbes in Human Welfare, from the NCERT Class 12 Biology textbook. The 34 questions are written directly from the chapter — definitions, processes, worked examples and the points the book italicises — so a score here tells you how much of the chapter actually stuck, not how well you guess. Each answer carries an explanation that says why the right option is right and why the other three fail, which is where most of the learning happens. Attempt it after your first read of the chapter, then again before the exam. There is no negative marking, and you can review the full solution the moment you submit.
Duration
34 mins
Questions
34 MCQs
Total Marks
34 pts
Negative
0 per wrong
Topics Covered in This Paper
Sample Questions
Q1.Lactic acid bacteria such as Lactobacillus convert milk into curd because during growth they:
- ASecrete enzymes that split the milk fats into fatty acids and glycerol
- BConsume the vitamin B12 present in the milk
- CProduce large amounts of carbon dioxide that puff up the milk
- DProduce acids that coagulate and partially digest the milk proteins
Q2.The puffed-up appearance of the dough used for making dosa and idli is due to:
- AThe production of methane by methanogens present in the batter
- BThe absorption of atmospheric air by the swelling rice grains
- CThe coagulation of proteins by acid-producing bacteria
- DThe production of carbon dioxide gas during fermentation by bacteria
Q3.The large holes in Swiss cheese are due to:
- AThe escape of methane produced by methanogens during ripening
- BThe action of lactic acid bacteria coagulating the milk proteins unevenly
- CThe production of a large amount of carbon dioxide by the bacterium Propionibacterium sharmanii
- DThe growth of a specific fungus that also gives the cheese its flavour
Before you begin
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Each correct answer carries +1 marks.
Each wrong answer carries -0 marks.
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Disclaimer: The questions provided here are extracted and digitized from previous year papers using automated processes. They may contain typographical errors, formatting issues, or minor variations from the actual examination paper. While we have done our best to verify the accuracy of the official answer keys, discrepancies may occasionally exist. Please refer to the official commission website for the most authentic paper.
Timer starts immediately and keeps running even if you close the tab. Make sure you have 34 uninterrupted minutes.
FAQ
Frequently asked questions
Frequently Asked Questions
- How many questions are in the NCERT Class 12 Biology Chapter 8 Microbes in Human Welfare Test mock test?
- This paper has 34 multiple-choice questions carrying 34 marks in total, to be attempted in 34 minutes.
- Is the NCERT Class 12 Biology Chapter 8 Microbes in Human Welfare Test mock test free to attempt?
- Yes. You can attempt the full paper online for free on AI Test Planet, and see your score and correct answers immediately after submitting.
- Does this paper have negative marking?
- No, there is no negative marking on this paper, so an attempted guess costs you nothing.
- Are solutions and explanations available?
- Yes. After you submit, every question shows the correct answer with a step-by-step explanation, along with a topic-wise breakdown of your performance.