Cell theory was proposed by two German biologists , matthas schielden and Theodor Schwann in 1838 and 1839 which states that all plants,animals and living organisms are made up of small units called cells. cells arise from the pre existing cells and cell is the basic structural and functional unit of an organism. thus,these are the postulates of the cell theory .
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**Cell Theory and its Main Postulates**

Cell theory is a fundamental concept in biology that describes the basic structural and functional unit of all living organisms. It was proposed by two scientists, Matthias Schleiden and Theodor Schwann, in the early 19th century. Their observations and research led to the formulation of the cell theory, which consists of three main postulates.

**1. The Cell is the Basic Unit of Life**

The first postulate of cell theory states that all living organisms are composed of cells. Cells are the smallest, most basic units of life and are capable of performing all the functions necessary for life. Whether an organism is a single-celled organism or a complex multicellular organism, it is composed of one or more cells. Cells are the building blocks of life, and they form the basis for the structure and function of all living organisms.

**2. All Cells Arise from Pre-existing Cells**

The second postulate of cell theory states that all cells arise from pre-existing cells. This concept, known as cell division or cell reproduction, is a fundamental process in biology. Cells can divide through various mechanisms such as mitosis, meiosis, or binary fission, depending on the type of organism. During cell division, the genetic material (DNA) is replicated and distributed equally between the newly formed cells. This process ensures the continuity of life and the passing on of genetic information from one generation to the next.

**Additional Information**

It is important to note that the cell theory has been further expanded and refined over time. For example, the third postulate of cell theory, which states that cells are the basic units of structure and function in living organisms, has been modified to include the concept of organelles within cells. Organelles are specialized structures within cells that perform specific functions. Examples of organelles include the nucleus, mitochondria, and chloroplasts.

Cell theory is a fundamental concept in biology and provides the basis for understanding the organization, structure, and function of living organisms. It has revolutionized our understanding of the natural world and has paved the way for advancements in various fields such as medicine, genetics, and biotechnology. By studying cells and their functions, scientists can gain insights into the complex processes of life and develop new strategies for combating diseases and improving human health.