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Characteristics of Life
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Characteristics of Life

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Transcript

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