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THE CELL: DEFINTION, STRUCTURE, FUNCTIONS CELL THEORY DEFINITION AND FORMS OF CELLULAR EXISTENCE The cell is the simplest, smallest, basic, structural and functional unit of life. The cell can carry out all life activities such as growth, respiration e. t. c. Cells can exist in various forms which include As a single cell (unicellular forms) g. Amoeba, Chlamydomonas, Chlorella, Euglena Chlamydomonas(Chlamydomonas rivalries)   Chlamydomonas is a unicellular plant like protist, motile using its flagellum and has a cup shaped chloroplast. It is sensitive to light using its eye spot. In the presence of light, starch grains appear in the cytoplasm. These disappear in a dark environment.   Chlamydomonas cells through its flagella (whip like) respond to changes in the surrounding such as moving from a dark region to a region of light. This organism disposes off its excess water using its contractile vacuoles. It reproduces asexually and sexually when it… Read More »THE CELL: DEFINTION, STRUCTURE AND FUNCTIONS

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