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 :-
Name the scientist who discovered cell _______________ | |||
| Right Option : A | |||
| View Explanation | |||
The term protoplasm has been coined by ____________________ . | |||
| Right Option : D | |||
| View Explanation | |||
Who observed and coined the word cells for the first time? | |||
| Right Option : B | |||
| View Explanation |
Students / Parents Reviews [10]
It was a good experience with Abhyas Academy. I even faced problems in starting but slowly and steadily overcomed. Especially reasoning classes helped me a lot.
Cheshta
10thI have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
Yatharthi Sharma
10thBeing a parent, I saw my daughter improvement in her studies by seeing a good result in all day to day compititive exam TMO, NSO, IEO etc and as well as studies. I have got a fruitful result from my daughter.
Prisha Gupta
8thAbhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
Manish Kumar
10thMy experience with Abhyas is very good. I have learnt many things here like vedic maths and reasoning also. Teachers here first take our doubts and then there are assignments to verify our weak points.
Shivam Rana
7thIt was good as the experience because as we had come here we had been improved in a such envirnment created here.Extra is taught which is beneficial for future.
Eshan Arora
8thMy experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
Ayan Ghosh
8thAbout Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
Shreya Shrivastava
8thMy experience with Abhyas academy is very good. I did not think that my every subject coming here will be so strong. The main thing is that the online tests had made me learn here more things.
Hiya Gupta
8thOne 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.
