BIOLOGY XI NOTES
THE CELL - THEORY & QUESTION ANSWERS
Chapter # 04
Theory & Question Answers
Section II - Unity of Life
THE CELL
DISCOVERY OF CELL:
The discovery of cells and their structure became possible with the development of optical lenses and with the construction of compound microscope, which was invented by David Jansen in 1590 and in 1610 Galileo designed it properly. Cells were first described in 1665 by Robert Hooke. Later, Robert Brown in 1831 discovered a spherical body, the nucleus, in the cells of orchids. In 1839 Theodore Schwann, observed that the nucleus was surrounded by a fluid in the cell.
