Sanyam Mehta IT Professional Private Sector 10 Years of Teaching Topic Of Discussion: Cell : Fundamental Unit of life Lesson : 1)
Definition Of cell Cell: Cell is most structural, fundamental & functional unit of life. All living organisms are composed of cells. Cell is known as most basic unit of life. Characteristics of Cells . Cells are very small units . Cells have independent existence. . Carry out all the functions required for a living being
Types of cells on the basis of presence of true nucleus: True nucleus: Membrane around DNA & RNA found in some organisms which is called as true nucleus. 1. Prokaryotic Cell True nucleus is absent Primitive & incomplete cells Prokaryotes are always 2. Eukaryotic Cell True nucleus is present Advanced & complete cells Eukaryotes can be both unicellular & multicellular Organisms unicellular organisms Eg. Blue green algae Eg. Human body
Cell Discovery Discovered by Robert Hooke in 1665 Observation 1. Organisms are composed of small compartments just like honeycomb These compartments are named as cells by him after comparing honeycomb with these small compartments. 2.
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