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| Organism and Its Characteristics |
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| An organism is a distinct unit of life in nature. It is said to be the smallest level and basic unit of ecological hierarchy. |
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| Characteristics of an organism |
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| An organism, |
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 performs all the life processes independently |
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 is a quantitative unit (that can be counted) |
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 has the ability to grow and regenerate. |
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 cannot live in isolation i.e., shows interdependence with other biotic and abiotic factors of the environment. |
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 resemble their parents and has a definite life span. |
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 ensures continuity of its race through transmission of characters to its offsprings through the process of reproduction. |
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| Ecological Hierarchy |
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