State the best-known contribution of the following scientists :(i) Ern

1.	State the best-known contribution of the following scientists :(i) Ernst Haeckel (ii) Carl Landsteiner (iii) Robert Koch
Answer» (1) Ernst Haeckel proposed biogenetic law which states that ‘Ontogeny repeats phylogeny’. (ii) Karl Landsteiner discovered ABO blood groups in human beings. (iii) Robert Koch (1843-1910) German physician contributed much to the field of microbiology and infectious diseases. He was the first to discover tuberculosis bacterium. He proposed Koch’s postulates which state certain requirements should be fulfilled if the disease causing character of any organism is to be proved. Hensen discovered the disease leprosy, proposed the sliding theory of muscle contraction.

State the best-known contribution of the following scientists :(i) Ernst Haeckel (ii) Carl Landsteiner (iii) Robert Koch

Answer»

(1) Ernst Haeckel proposed biogenetic law which states that ‘Ontogeny repeats phylogeny’.

(ii) Karl Landsteiner discovered ABO blood groups in human beings.

(iii) Robert Koch (1843-1910) German physician contributed much to the field of microbiology and infectious diseases. He was the first to discover tuberculosis bacterium. He proposed Koch’s postulates which state certain requirements should be fulfilled if the disease causing character of any organism is to be proved.

Hensen discovered the disease leprosy, proposed the sliding theory of muscle contraction.

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