The cell can be defined as the structural and functional unit of life. It is the smallest unit that can carry out all activities of life. Cells are building blocks of complex multicellular organisms.
Emergence and Implication of Cell Theory
Discovery of cell.
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 beginning of 19th century.
Emergence of Cell Theory.
They found that the cell consists of 3 basic parts, viz nucleus, the fluid (cytoplasm) surrounding the nucleus, and an outer thin covering or membrane (plasma membrane).
The cell wall, they said, was an additional structure, present only in plant cell.
Keeping in view this definition of cell, the cell could be observed in plants as well as in animal according to cell theory, all living organisms are composed of cells and cell products.
The cell theory is one of the most fundamental generalizations in Biology. It has wide ranging effect in all fields of biological sciences. After, the cell theory was presented, many details of cell were studied, as a result of which the cell theory was extended.
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