Penicillin was discovered by
AErnest Boris Chain
BLouis Pasteur
CRobert Koch
DAlexander Fleming
Answer & Solution
Correct answer: D. Alexander Fleming
1. Penicillin was the first antibiotic to be discovered, and by chance.
2. Alexander Fleming, working on Staphylococci bacteria, saw a mould on an unwashed culture plate.
3. Staphylococci could not grow around that mould.
4. He traced this to a chemical from the mould and named it Penicillin.
5. Ernest Chain and Howard Florey later established its full potential as an antibiotic.
_Source: NCERT Class 12 Biology Ch8 'Microbes in Human Welfare'_
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