Useful and Harmful Microbes
Maharashtra Board · Class 9 · Science
Most important questions from Useful and Harmful Microbes for Maharashtra Board Class 9 Science board exam 2026. MCQs, short answer, and long answer questions with marks.
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Sample Questions
Which of the following are products of lactobacilli fermentation? (Select all correct answers)
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Yoghurt, Buttermilk, Cheese
Lactobacilli fermentation produces various milk products like yoghurt, buttermilk, and cheese. Bread is made by yeast fermentation, and wine is also produced by yeast.
Antibiotics are obtained from which microorganisms?
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Both bacteria and fungi
Antibiotics are carbon compounds obtained from both bacteria and fungi that can destroy or prevent the growth of harmful microorganisms.
Which scientist discovered penicillin?
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Alexander Fleming
Alexander Fleming discovered penicillin in 1928 when he observed that a fungus (Penicillium) had destroyed bacterial colonies in his laboratory.
Which bacteria causes food poisoning in community feasts?
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Clostridium
Clostridium bacteria spoil cooked food and cause food poisoning. They are anaerobic bacteria that cannot withstand normal oxygen levels.
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