Sunday, 14 April 2013

Cell,Nucleous,Protoplasm,cell theory,


Define a cell. Who discovered cell?
Cells are the fundamental structural units of living organisms and the basic units of life. Robert Hooke discovered the cell in the year 1665 as a thin section of cork under the self made microscope.
Who discovered first living cell?
Leeuwenhoek discovered the free living cells in pond water for the first time. 
In the year 1674, with the help of improved microscope.

How does the cell of a onion peel look like?
The cell of onion peel looks like as following

Who discovered nucleus in the cell?
Robert Brown discovered the nucleus in the cell in the year of in 1831.

Who coined the term ‘protoplasm’ for the fluid substance of the cell?

J. E. Purkinje in the year 1839 coined the term ‘protoplasm’ for the fluid substance of the cell.

Who gave the cell theory? Who expanded it further?

The cell theory which states that all the plants and animals are composed of cells and that the cell is the basic unit of life was presented by two biologists, Schleiden (1838) and Schwann (1839).

Who gave the cell theory that the cell comes from the pre existing cell?

The theory that the every cell comes from pre existing cell was given by Virchow in the year of 1855.

2 comments:

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