CLASS IX NCERT SCIENCE Chapter 5 Fundamental Unit of Life : Cell
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What are living beings made up of ???? Living organisms are made up of microscopic units called cells Basic structural and functional unit of living organisms. Discovered by Robert Hooke.
Cells of an onion peel
Cellular level - Most important and fundamental level in the organization of living world Cell biology Study of cells in al aspects of structure and functions. Anton von Leeuwenhoek made an improved microscope and using this microscope he discovered free living cells in pond water.
Classification Based on the no. of cells - Organism:s Unicellular Multicellular
Characteristics Multicellular organisms Consists of large number of cells. Cells are specified to perform different functions. Different cells perform different specific functions. Unicellular organisms Cell Number Contains only a single cell. Division of labor No division of labor. Function:s All the activities are performed by a single cell. Reproduction Involves same single cel. Specialised cell only take part in reproduction Long. Plants, Animals. Life span Short. Example Amoeba, Yeast.
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