Question

Why cell was discovered?

Answer 1

If u r asking how then,
Robert Hooke was observing a cork of wood under a microscope and he found many small compartments just like in a beehive and he named them cells.

If u r asking why then,
Why not?

Answer 2

The cell was first discovered and named by robert Hooke in 1665. He remarked that it looked strangely similar to cellula or small rooms which monks inhabited, thus deriving the name. However what Hooke actually saw was the dead cell walls of plant cells (cork) as it appeared under the microscope.