Question

discovery of cells..............​

Answer 1

Answer :-

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Discovery of cells -

▪ A non - living cells was discovered by Robert Hooke in 1665 by the self - designed microscope or primitive microscope.

▪ In 1664, Antonvan Leeuwenhoek discovered are living cells in pond water by improved microscope.

▪He also discovered and identify the sperm cells of humans, dogs, rabbits, etc.

▪ In 1831, Robert Brown discovered the nucleus in plants.

▪ Purkinje in 1839, if the term of protoplasm fluid substance inside the cells.

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Answer 2

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★ Discovery of cell :-

● Robert Hooke (1665), an English Botanist, observed thin sections of cork of bark of a tree under a self - designed compound microscope and noticed honey - comb like compartments. He coined them as cells. Term cell was derived from a Latin word cella - a little room. He explained his observations in a Book namely, Micrographia. He actually observed the rigid cell walls of Dead cells.

● Anton von Leeuwenhoek (1674), a Dutch draper, was first to observe living cells like bacteria ( from tartar of teech), erythrocytes (of a fish), sperms ( were called animalcules) and protozoans (e.g. Vorticella).

● N. Grew (1682) proposed cell concept which states that cell is unit of structure of organisms.

● Robert Brown (1831) : Discovered the nucleus in the root cells of orchid plant.

● Purkinje (1839) : Gave the term protoplasm for the jelly - like semifluid material of the cells.

● M.J. Schleidin (1839) & Theodore Schwann (1839) : Proposed the cell theory which states that the basic structure and function of all the plants and animals is cell.

● Rudolf Virchow (1859), a German Physiologist, proposed Theory of Lineage which states "omis cellula e cellula" which meals that new cells are formed from the pre - existing cells.

● Knoll & Ruska (1932) of Germany designed the electron microscope which was employed to study the ultrastructure (fine structure) of cells and various cell organelles in 1940s.