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CBSE 9th Biology | Organization in the Living World-The Fundamental unit of life
Organization in the Living World-The Fundamental unit of life QUICK CONCEPT REVIEW SUMMARY: The year 1665 is of great importance in the history of science because Robert Hooke discovered that all living things consist of separate units called cells. Hooke’s observations were based on his experiment with cork which comes from the bark of Quercus…
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Biology IX | Health and Diseases | Part 2
Health and Diseases | Part 2 Disease caused by bacteria Tuberculosis (T.B.) Tuberculosis (T.B.) was first discovered by Robert Koch in 1882. It is caused by a bacterium called Mycobacterium tuberculosis. The bacterium releases a toxin called tuberculin. T.B. can affect all parts of the body. In human beings, the infection spreads by inhaling infected…