What Is The Emergence And Implication Of Cell Theory?


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Haider Imtiaz answered
Study of cell (cell biology) began with the discovery of cell by Robert Hooke (1665), who reported his work in his famous publication Micrographia. He prepared and studied thin section of cork (of dead plant material) under his self-made compound microscope.

He observed that the cork is composed of minute honey comb like compartments which he termed as Cells. According to Hooke, cell is an empty space bounded by thick walls. Very little information was added to this idea in the following century. The work again started in the begging of 9th century.

Lorenz Oken (1805) a German scientist, believed that, "all living beings originate from or consist of vesicles or cells". Jeans Baptist de-Lamarck (1809) expressed similar idea and said "no body can have life if its constituent parts are not cellular tissue or are not formed by cellular tissue".

In 1831 Robert Brown reported the presence of nucleus in the cell. Due to this discovery Hooke's idea about the cell as an empty space was changed. It was letter established that cell is not an empty. A German zoologist Theodor Schwann (1838), working independently, came out with the theory called the Cell Theory.

Cell is not only the structural but also the functional unit of living organisms. So cell theory is a very unifying concept.
The salient features of Cell Theory in its present form are:
1. All organisms are composed of one or more cell.
2. All cells arise from pre-existing cells.
3. Cell is the basic structural as well as functional unit for all organisms.

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