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Introduction Of Cell Chapter | Cell Theory | Class 11 (Urdu/Hindi)
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Hi Everyone! Welcome To My Channel "Ali Academy Biology Lectures"
About This Video ........................
In This Video Lecture You Will Learn Basic Concept Of Introduction of cell
Study of cell (cell biology) began with the discovery of cell by Robert Hooke (1665), who reported
They found that the cell consisted of 3 basic parts, viz
cells”. Jean Baptist de-Lamarck (1809) expressed similar
cellular tissue”.
information was added to this idea in the following century. The work again started in the beginning
In 1831 Robert Brown reported the presence of nucleus
He observed that the cork is composed of minute honey comb like compartments which he termed
as Cells (Fig.4.1). According to Hooke, cell is an empty space bounded by thick walls. Very little
in the cell. Due to this discovery Hooke’s idea about
came out with a theory called the Cell Theory.
Lorenz Oken (1805) a German scientist , believed that
piece of cork
“all living beings originate from or consist of vesicles or
idea and said “no body can have life if its constituent
Fig.4.1 The microscopic structure of a
the cell as an empty space was changed. It was later
botanist Schleiden (1838), working independently,
nucleus, the luid (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
his work in his famous publication Micrographia. He prepared and studied thin sections of cork (of
zoologist Theodor Schwann (1839) and a German
of 19th century.
dead plant material) under his self-made compound microscope.
cell. Keeping in view this deinition of cell, the cells could be observed in plant as well as in animal;
parts are not cellular tissue or are not formed by
established that cell is not an empty space. A German
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 efect
in all ields of biological sciences. After the cell theory was presented, many details of cell were
many respects. Cells are basically similar but extraordinarily versatile. Cell is not only the structural
Pasteur (1862), one of the greatest scientists of all times, supplied experimental proof for Virchow’s
hypothesis by demonstrating that microorganisms (bacteria) could be formed only from existing
similarities in the chemical composition, metabolic activities and structure, although they difer in
Rudolph Virchow (1855), a German physician, hypothesized that new cells were formed only
by the division of previously existing living cells (to put it in Virchow’s words : “omnis cellula e
bacteria. Original cell theory and Virchow’s hypothesis gave us the basis for working deinition of
cellula”). It was contrary to the idea of “abiogenesis” (living things arise spontaneously from non
living things: living things are chemical organizations composed of cells and capable of reproducing
studied, as a result of which the cell theory was extended.
they have basic similarities in structure and molecules etc. It was shown that there are fundamental
themselves’. August Weismann (1880) said ‘all presently living cells have a common origin because
living things), one of the prevailing but controversial ideas about origin of life, at that time. Louis
but also the functional unit of living organisms. So cell theory is a very important unifying concept.
About This Channel.....................
I make these videos cause I love to draw and connect the complexity of science and medicine into art. I'm not saying. I'm 100% correct in all my videos, but I do try to obtain the information from credible sources.
One-stop destination for all biology lectures.
_ students in class 11, 12 or appearing for competitive medical exams ( NMDCAT ) will find it very beneficial
_ The videos are categories under various heading to make the students life simplified
Visit My Other Channel Playlist .....................
Class 10th Lectures:
Subscribe My Channel:
Social Link........................
Instagram:
About This Video ........................
In This Video Lecture You Will Learn Basic Concept Of Introduction of cell
Study of cell (cell biology) began with the discovery of cell by Robert Hooke (1665), who reported
They found that the cell consisted of 3 basic parts, viz
cells”. Jean Baptist de-Lamarck (1809) expressed similar
cellular tissue”.
information was added to this idea in the following century. The work again started in the beginning
In 1831 Robert Brown reported the presence of nucleus
He observed that the cork is composed of minute honey comb like compartments which he termed
as Cells (Fig.4.1). According to Hooke, cell is an empty space bounded by thick walls. Very little
in the cell. Due to this discovery Hooke’s idea about
came out with a theory called the Cell Theory.
Lorenz Oken (1805) a German scientist , believed that
piece of cork
“all living beings originate from or consist of vesicles or
idea and said “no body can have life if its constituent
Fig.4.1 The microscopic structure of a
the cell as an empty space was changed. It was later
botanist Schleiden (1838), working independently,
nucleus, the luid (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
his work in his famous publication Micrographia. He prepared and studied thin sections of cork (of
zoologist Theodor Schwann (1839) and a German
of 19th century.
dead plant material) under his self-made compound microscope.
cell. Keeping in view this deinition of cell, the cells could be observed in plant as well as in animal;
parts are not cellular tissue or are not formed by
established that cell is not an empty space. A German
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 efect
in all ields of biological sciences. After the cell theory was presented, many details of cell were
many respects. Cells are basically similar but extraordinarily versatile. Cell is not only the structural
Pasteur (1862), one of the greatest scientists of all times, supplied experimental proof for Virchow’s
hypothesis by demonstrating that microorganisms (bacteria) could be formed only from existing
similarities in the chemical composition, metabolic activities and structure, although they difer in
Rudolph Virchow (1855), a German physician, hypothesized that new cells were formed only
by the division of previously existing living cells (to put it in Virchow’s words : “omnis cellula e
bacteria. Original cell theory and Virchow’s hypothesis gave us the basis for working deinition of
cellula”). It was contrary to the idea of “abiogenesis” (living things arise spontaneously from non
living things: living things are chemical organizations composed of cells and capable of reproducing
studied, as a result of which the cell theory was extended.
they have basic similarities in structure and molecules etc. It was shown that there are fundamental
themselves’. August Weismann (1880) said ‘all presently living cells have a common origin because
living things), one of the prevailing but controversial ideas about origin of life, at that time. Louis
but also the functional unit of living organisms. So cell theory is a very important unifying concept.
About This Channel.....................
I make these videos cause I love to draw and connect the complexity of science and medicine into art. I'm not saying. I'm 100% correct in all my videos, but I do try to obtain the information from credible sources.
One-stop destination for all biology lectures.
_ students in class 11, 12 or appearing for competitive medical exams ( NMDCAT ) will find it very beneficial
_ The videos are categories under various heading to make the students life simplified
Visit My Other Channel Playlist .....................
Class 10th Lectures:
Subscribe My Channel:
Social Link........................
Instagram:
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