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Class 12 Biology — Chapter 8: Microbes in Human Welfare
90 practice questions · 30 Easy · 30 Medium · 30 Hard
Free NCERT-aligned multiple-choice practice for Class 12 Biology, Chapter 8 (Microbes in Human Welfare). Practise timed Easy, Medium and Hard quizzes with instant explanations — built for CBSE Board exams, JEE Main and NEET UG. Here are a few sample questions; sign in free to practise all 90.
Sample questions
Q1Easy
Curd from milk is produced by:
A.Lactobacillus✓ correct
B.E. coli
C.Yeast
D.Bacillus subtilis
Why
Lactic acid fermentation.
Q2Medium
Activated sludge in sewage treatment is rich in:
A.Aerobic bacteria✓ correct
B.Anaerobes only
C.Viruses
D.Algae
Why
Decompose organic matter.
Q3Hard
Biogas (gobar gas) is mainly:
A.Methane✓ correct
B.Ethane
C.Propane
D.Butane
Why
Methanogens produce CH₄.
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