The Characteristics of Life
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Transcript of The Characteristics of Life
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The Characteristics of Life
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The Characteristics of Life History:
Spontaneous Generation or Abiogenesis-
•1st proposed by Aristotle
•held that complex, living organisms are generated by decaying organic substances,
•e.g. that mice spontaneously appear in stored grain or maggots spontaneously appear in meat.
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The Characteristics of Life History:•Was widely believed until the 19th century.
•Several scientists performed experiments that disproved spontaneous generation
•Francisco Redi
•Lazzaro Spallanzani
•Louis Pasteur
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Redi’s Experiment
Francisco Redi
1668
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Spallanzani’s Experiment
Lazzaro Spallanzani
1746
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Pasteur’s Experiment
Louis Pasteur
1859
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The Characteristics of Life History:
Biogenesis- is the process of life forms producing other life forms
• e.g. a spider lays eggs, which form into spiders.
•The term is also used for the assertion that life can only be passed on by living things.
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The Characteristics of Life
How can you tell if something is alive?
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The Characteristics of Life
Biologists have devised a list of 5 characteristics that define life.
Something can be considered alive ONLY if it displays ALL 5 of the characteristics.
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The Characteristics of Life
Anything that possesses all 5 of the characteristics of life is called an organism.
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The 5 characteristics of life are:
1. Cellular Organization celltissueorgansystemorganism
2. Growth & Development
3. Reproduction
4. Adaptation to environment – response to a stimulus
5. Maintenance of Homeostasis
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The Characteristics of Life
Organization:
All living organisms have an organized structure
Ex. -Cells form tissues
-Tissues form organs
-Organs form organ systems
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The Characteristics of Life
All living organisms grow and develop during their life spans.
Growth & Development:
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The Characteristics of Life
Growth: an increase in the size of an organism due to an increase in the size and number of cells
Development: all of the changes that take place throughout the life span of an organism
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The Characteristics of Life
Reproduction:All living organisms are able to produce live offspring.
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The Characteristics of Life
Adaptation to environment:
All living organisms are able to adapt to their surroundings.
They are able to react, or respond to an environmental condition, or stimulus.
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The Characteristics of Life
Maintenance of Homeostasis:
All living organisms are able to maintain a relatively constant internal environment.
Homeostasis: The regulation of an organism’s internal environment to maintain conditions suitable for life.
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The Characteristics of Life
Are bacteria alive?
How about viruses?