Discovery of Cell
Discovery of Cell
Robert Hooke (1665) while examining a thin slice of cork under the primitive microscope, observed that cork consists of small box like structure resembling honeycomb. He called these boxes 'cells'. The substance called cork comes from the bark of a tree. The use of word "Cell" to describe these units is used till today in biology. Cell is a Latin word for 'a little room'. The ordinary compound microscope of today is a greatly improved design of the original Hooke's microscope.
Antony van Leeuwenhoek(1632 - 1723) was an ordinary public official who ground lenses and made microscope observations as a hobby. He examined pond water in 1674, and observed dozens of protists which he called 'animalcules,' as well as Spirogyra or Green algae.
These discoveries helped us to understand different characteristics of cells. Some of these characteristics are :-
In 1838, Matthias Schleiden , a German Botanist, announced that every plant is made up of a large number of cells and each of these cells performed various life processes. A year later, Theodor Schwann, a German Zoologist, made similar discoveries in animals. These discoveries of two different scientists ultimately got published as Cell Theory in `1839.
Rudolf Virchow in 1858 made an addition to the cell theory by saying that all cells arise from pre - existing cells.
According to Cell Theory :-
The cells were discovered by ____________________________, English scientist in 1665 . | |||
| Right Option : A | |||
| View Explanation | |||
Nucleus was discovered by ___________________________. | |||
| Right Option : B | |||
| View Explanation | |||
Living cells were discovered by _______________. | |||
| Right Option : C | |||
| View Explanation | |||
Students / Parents Reviews [10]
Abhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
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10thOne of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
