Question

Match the scientists and their contribution given in columns.

Scientists	Contributions
(A) W. His	(p) X-ray crystallography
(B) Knoll and Ruska	(q) Column chromatography
(C) Bragg	(r) Microtome
(D) Tswett	(s) Electron microscope

• A. A- r, B- s, C- p, D- q
• B. A- s, B- q, C- r, D- p
• C. A- r, B- s, C- q, D- p
• D. A- p, B- r, C- s, D- q

Answer 1

Answer: (A)

A- r, B- s, C- p, D- q

Wilhelm His was a Swiss anatomist who invented the microtome.
German engineer Max Knoll and physicist Ernst Ruska are recognized for the development of the first electron microscope, in 1932, with Ruska being awarded the Nobel Prize in 1986, for his work in electron optics.
William Lawrence Bragg was a physicist and X-ray crystallographer and he was the discoverer of the Bragg's law of X-ray diffraction.
M. S. Tswett represented the first report on the chromatographic technique.

Thus, the correct answer is option A.