Question

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

Answer 1

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INTRODUCTION:

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

BRIEF DESCRIPTION:

The microscopes we use today are far more complex than those used in the 1600s by Antony van Leeuwenhoek, a Dutch shopkeeper who had great skill in crafting lenses. Despite the limitations of his now-ancient lenses, van Leeuwenhoek observed the movements of protista (a type of single-celled organism) and sperm, which he collectively termed “animalcules. ”

The microscopes we use today are far more complex than those used in the 1600s by Antony van Leeuwenhoek, a Dutch shopkeeper who had great skill in crafting lenses. Despite the limitations of his now-ancient lenses, van Leeuwenhoek observed the movements of protista (a type of single-celled organism) and sperm, which he collectively termed “animalcules. ”In a 1665 publication called Micrographia, experimental scientist Robert Hooke coined the term “cell” for the box-like structures he observed when viewing cork tissue through a lens. In the 1670s, van Leeuwenhoek discovered bacteria and protozoa. Later advances in lenses, microscope construction, and staining techniques enabled other scientists to see some components inside cells.

SILENT FEATURES:

1. All animals and plants are made up of cells and cell products. Among these some organisms are unicellular and some are multicellular.

2. Cell is structural and functional unit of living organisms.

3. New cells come from the divisions of pre-existing cell.

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Answer 2

Answer:

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J.Schledian and Theodor Schwann proposed cell theory in 1838-39.

Salient features:-

• All the organisms are made up of cells.
• All cells arise from pre-existing cells.
• All the cells are made up of similar chemicals and show similar metabolic activities.
• Functions of organisms depend on the functions arrived out by different cells in that organisms.
• You can find green patterns they are chloroplasts.