Question

The concept that organiser is essential for embryonic development was given by

• A. J. Axelrod
• B. C. Landsteiner
• C. H. Spemann
• D. I.P. Pavlov

Answer 1

Answer: (C)

H. Spemann

Hans Spemann described an area in the embryo and some portions of the embryo that organize or induce secondary embryonic primordia (regardless of location) when transplanted into a second embryo. These areas are called as the "organizer centres" or just "organisers". Different parts of the organizer centre produce different parts of the embryo.
Hans Spemann was awarded 'Nobel prize in Physiology or Medicine' in 1935 for the discovery of embryonic induction phenomenon.
Thus, the correct answer is option C.