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Alexander Flemming discovered penicillin...

Alexander Flemming discovered penicillin in 1928 while working with :-

A

Streptomyces

B

Bacteria (Staphylococus)

C

Penicilium notatum

D

P.chrysogenum

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The correct Answer is:
**Step-by-Step Solution:** 1. **Identify the Researcher and Year**: The question asks about Alexander Fleming and the year he discovered penicillin, which is 1928. 2. **Understand the Context of the Discovery**: Fleming was investigating the properties of bacteria, specifically a type called Staphylococcus. 3. **Observation of Contamination**: During his research, he noticed that his bacterial culture was contaminated with a fungus. 4. **Effect of the Fungus**: He observed that the bacteria surrounding the fungus were being destroyed, indicating that the fungus produced a substance harmful to the bacteria. 5. **Identification of the Fungus**: Fleming identified the mold as belonging to the Penicillium genus. 6. **Naming the Substance**: The substance produced by the Penicillium mold that killed the bacteria was named penicillin. 7. **Antibacterial Properties**: Fleming noted that penicillin had strong antibacterial properties, particularly against gram-positive bacteria such as Staphylococcus. 8. **Conclusion**: Therefore, the correct answer to the question is that Alexander Fleming discovered penicillin in 1928 while working with Staphylococcus. **Final Answer**: Alexander Fleming discovered penicillin in 1928 while working with Staphylococcus. ---
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