Question

State the most significant contribution of the following scientists.
(i) Hans Berger
(ii) Dixon and Jolly
(iii) J. B. Lamarck
(iv) William Harvey

Answer 1

(i) Hans Berger is a German psychiatrist who invented electroencephalography (EEG). He had also discovered the Berger's wave.

(ii) Dixon and Jolly have given the cohesion-tension or cohesion and adhesion theory. This theory is also known as transpirational pull theory and was supported by other scientists.

(iii) Jean Baptiste Lamarck was a French naturalist, who has given the theory of inheritance of acquired characters (Lamarckism).

(iv) William Harvey was an English physician who described the systemic circulation in detail. He had also described the properties of blood being pumped to the brain and body by the heart.