Who first observed bacteria under a microscope?
Answer and explanation
Correct answer: B. Antonie van Leeuwenhoek
- Step 1: The earliest direct observation of microscopic single-celled organisms occurred in the 1670s using high-power single-lens microscopes.
- Step 2: Antonie van Leeuwenhoek discovered and described bacteria and protozoa, which he originally termed 'animalcules', in samples of dental plaque and pond water.
Answer
Antonie van Leeuwenhoek.
Why not the others: 'Robert Hooke' discovered and named 'cells' in 1665 while examining cork tissue; 'Louis Pasteur' disproved spontaneous generation and established germ theory; 'Robert Koch' formulated Koch's postulates linking specific microbes to specific infectious diseases.
Practise more Diversity of living organisms.
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