Class 12 · Biology
Microbes in Human Welfare
NEET questions.
Build recall through active solving with original NEET-style MCQs, worked explanations and chapter-level NCERT provenance.
150 verified questions · NCERT chapter mapped · automatic error log
BiologyPlate 55
NeetVellum atlas · fig. biology
55
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Three examples from the live 150-question bank. Answers appear after attempting them in practice mode.
Example 1 · difficulty 1/5
A spoonful of previously prepared curd added to warm milk turns the whole batch into curd overnight. This happens because the bacteria present in the starter:
- A. secrete rennin that directly hydrolyses the milk protein
- B. oxidise milk fat into short-chain fatty acids
- C. convert milk sugar into lactic acid, causing partial coagulation of milk protein
- D. ferment milk sugar into ethanol and carbon dioxide
Example 2 · difficulty 2/5
Swiss cheese is easily recognised by its large holes. These holes develop during ripening when the bacterium Propionibacterium sharmanii releases:
- A. large amounts of carbon dioxide
- B. lactic acid that dissolves pockets into the curd
- C. hydrogen gas that gets trapped within the curd
- D. proteolytic enzymes that digest portions of the curd
Example 3 · difficulty 2/5
Which of the following microbe–industrial product pairs is correctly matched?
- A. Butyric acid – Aspergillus niger
- B. Acetic acid – Clostridium butylicum
- C. Lactic acid – Acetobacter aceti
- D. Citric acid – Aspergillus niger
The chapter mastery loop
- 1. Attempt firstExpose recall gaps before rereading.
- 2. Classify the missConcept, careless, rushed or guessed.
- 3. Re-practiceReturn until the error pattern disappears.
Frequently asked questions
How many Microbes in Human Welfare NEET questions are available?
NeetVellum publishes 150 verified questions for this chapter. Free accounts use the daily UG quota; UG Pro removes it.
How should I revise Microbes in Human Welfare for NEET?
Attempt questions before rereading, classify each miss, revisit the exposed NCERT concept, then re-practice until the error pattern disappears.