The cell theory, that all the plants and animals are composed of cells and that the cell is the basic unit of life, was presented by: -?

Question

Answer

The classical cell theory was proposed by Theodor Schwann in 1839. There are three parts to this theory. -

*The first part states that all organisms are made of cells. *The second part states that cells are the basic units of life. These parts were based on a conclusion made by Schwann and Matthias Schleiden in 1838, after comparing their observations of plant and animal cells. The third part, which asserts that cells come from preexisting cells that have multiplied, was described by Rudolf Virchow in 1858, when he stated omnis cellula e cellula (all cells come from cells).

Answer

The cell theory was proposed by two scientists- Schleiden (1838)and Schwann (1839). It says that all the plants and animals are composed of cells and the cell is the basic unit of life. The cell theory was further expanded by Virchow (1855) by suggesting that all cells arise from pre-existing cells.
The modern version of the Cell Theory includes the ideas that:

Energy flow occurs within cells.

Heredity information (DNA) is passed on from cell to cell.

All cells have the same basic chemical composition.

Answer

The cell theory, which states that all plants and animals are composed of cells and that the cell is the basic unit of life, was presented by three scientists: Matthias Schleiden, Theodor Schwann, and Rudolf Virchow.

1. Matthias Schleiden:
Matthias Schleiden was a German botanist who made significant contributions to the field of plant biology. In 1838, he proposed that all plants are composed of cells. Schleiden observed plant tissues under a microscope and concluded that cells were the fundamental building blocks of plants. He believed that cells were independent entities that could exist on their own.

2. Theodor Schwann:
Theodor Schwann, a German physiologist, expanded upon Schleiden's ideas and extended the cell theory to include animals as well. In 1839, Schwann stated that all animals are composed of cells. He conducted experiments on various animal tissues and observed that they also consisted of cells. Schwann's work helped establish the notion that cells are not limited to plants but are universal components of living organisms.

3. Rudolf Virchow:
Rudolf Virchow, a German physician and pathologist, further contributed to the cell theory in 1855. He emphasized the concept of cell division and proposed that all cells arise from pre-existing cells. Virchow's principle of 'omnis cellula e cellula' (every cell originates from another cell) challenged the prevailing belief of spontaneous generation and laid the foundation for modern cell biology.

The combined efforts of Schleiden, Schwann, and Virchow formed the basis of the cell theory. Their observations and conclusions revolutionized the field of biology by establishing cells as the fundamental units of life. The cell theory provided a framework for understanding the structure, function, and development of all living organisms.

In conclusion, the cell theory presented by Matthias Schleiden, Theodor Schwann, and Rudolf Virchow states that all plants and animals are composed of cells, and the cell is the basic unit of life. This theory has since been widely accepted and forms the cornerstone of modern biology.

Similar Class 9 Doubts

Can you explain the answer of this question below:Which is not a postulate of cell theory?A:All organisms are composed of cells.B:Plant cells carry out photosynthesis.C:Cell is the basic unit of life.D:All cells arise from pre-existing cells.The answer is b.

Which of the following statements is incorrect?

cell wall provides rigidity to plants but in animals it is absent so who do the work of cell wall in animals

Different between plants cell vacuole and animals cell vacuole?

Which cell is present in animals and plants?

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