Biology lesson on cells
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Biology lesson on cells. LESSON OBJECTIVES:. By the end of this lesson, you should be able to:.
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Meaning of the cell. The cell can be defined as the fundamental, basic unit of life.
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Cells vary in sizes. Bacteria cell. Large yolk cell of an Ostritch.
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Form in which cells exist. Cells exist in the following forms: As free independent unicellular organisms As colonies As filaments.
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As free independent unicellular organisms. Cells live as independent organisms and carry out the basic functions of life.
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Cells existing as colonies. B. Colonial Organisins Consist of groups of unicellular organisnus clustered together. Ex. volvox aureus (type Of algae) Each cell is held to other cells using cytoplasn•ic strands. They are still single— celled organisrns vvorking together..
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Cells existing as colonies. Fig : A Volvox colony.
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Cells existing as colonies. log noz.
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Cells existing as filaments. Certain cells are known to exist in the form of filaments:.
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Lesson summary. In this lesson, you have learnt that:.