Question

Cleavage was first observed by

• A. Swammerdam
• B. Spallanzani
• C. F.R. Lillie
• D. Leeuwenhoek

Answer 1

The correct option is A Swammerdam

Jan Swammerdam was the Dutch naturalist and he first observed the cleavage of the egg in the 17${}^{th}$ century and he saw the first furrow of the frog's egg in cleavage.
Spallanzani was the first one to disprove spontaneous generation.
F.R. Lillie identified the influence of potassium on cell differentiation.
Leeuwenhoek was the first to observe bacteria and protozoa.
Thus, the correct answer is option A.