Characteristics of Life

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Characteristics of Life

  1. 1. Characteristics of Life<br />
  2. 2. Characteristics of Life<br />Order<br />Cells<br />Reproduction<br />Heredity<br />Growth<br />Metabolism<br />Response to Environment<br />Homeostasis<br />Adaptation<br />
  3. 3. Order<br />Living things have order and complexity not found in lifeless objects<br />Living things are organized on several levels, and each level higher up the hierarchy represents an increase in complexity<br />
  4. 4. Cells<br />The cell is the fundamental unit of life<br />Unicellular organisms are made of one cell and self sufficient<br />Multicellular organisms consist of multiple cells, and they are more complex than unicellular organism<br />
  5. 5. Reproduction<br />Living things make a copy of itself by the process of reproduction<br />Asexual reproduction involves one parent producing offspring identical to the parent<br />Sexual reproduction involves the union of gametes contributed by each parent of the opposite sex<br />
  6. 6. Heredity<br />Living things inherit trait from their parents<br />Genes are the basic unit of inheritance<br />DNA molecules contain genes that code for proteins important for proper functioning of an organism<br />
  7. 7. Growth<br />Living things grow by taking in material from the environment and incorporated it in their structure<br />
  8. 8. Metabolism<br />Living things need energy to maintain its complex structures and functions<br />Metabolism is the set of chemical reactions in an organism<br />Some substances are broken down to yield energy, and some substances are synthesized<br />
  9. 9. Response to Environment<br />Living things must respond to external stimuli in the environment<br />Light, heat, chemical and mechanical contact are some examples of external stimuli<br />
  10. 10. Homeostasis<br />Living organism must maintain internal environment within tolerable limit<br />Feedback control comprising of receptors and effectors ensures condition remain favourable<br />
  11. 11. Adaptation<br />Living things are perfectly adapted to live in their changing environment<br />Adaptation includes morphological, physiological and behavioral adaptations<br />

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