Question

who and when was "The cell theory " proposed. when did they prepare it ?what are its salient features of​

Answer 1

Answer:

Explanation:

The Cell Theory was proposed by M. J. Schleiden and Theodor Schwan.

Scheleiden prepared the cell theory in plants of 1838 and Schwan prepared the cell theory of animals in 1839.

The salient features of it are:

. Cell is the unit of structures.

. Cell is the unit of function.

. Cell is the unit of heredity.

. All living cells arise only from the pre-existing cells.

Answer 2

Two scientists are widely credited with establishing cell theory: Theodor Schwann and Matthias Jakob Schleiden.  While Rudolf Virchow contributed to the theory, he is not as well known for his contributions to the theory's attributions.

• Schleiden proposed in 1839 that every structural component of a plant is made up of cells or is the product of cells. He also proposed that cells were formed through a crystallisation process that occurred either within other cells or outside of them.
• Schleiden, on the other hand, did not come up with the idea. Although Barthelemy Dumortier had proposed this hypothesis years before him, he claimed it as his own.
• Modern cell theory no longer accepts this crystallisation process.
• Animals, like plants, are formed of cells or the products of cells in their structures, according to Theodor Schwann in 1839. This was a significant breakthrough in biology because, in comparison to plants, little was understood about animal structure at the time.
• Two of the three tenets of cell theory were proposed based on these discoveries about plants and animals.
• 1. Every live entity contains one or more cells.
• 2. The cell is life's most fundamental unit.
• Robert Remak, Rudolf Virchow, and Albert Kolliker rejected Schleiden's idea of free cell creation through crystallisation in the 1850s.
• The third postulate of cell theory was added by Rudolf Virchow in 1855. This tenet is written in Latin as Omnis cellula e cellula.  This is what it means: Only pre-existing cells give rise to new cells.
• The following are components of modern cell theory that are widely accepted:
• 1. One or more cells make up all known living entities.
• 2. By division, all live cells develop from pre-existing cells.
• 3. In all living species, the cell is the basic structural and functional unit.
• 4. The cumulative activity of separate cells determines an organism's activity.
• 5. Within cells, energy flow (metabolism and biochemistry) happens.
• 6. Cells have DNA, which is present in the chromosome, as well as RNA, which is found in the nucleus and cytoplasm.
• 7. In creatures of similar species, all cells have a chemical composition that is nearly identical.