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Features of Life

Features of Life. Biology. Defined : the study of life Organism : anything that can carry on the processes of life Species : organisms that can create fertile offspring Over 2 million known species More diverse along equator Oldest life (bacteria) = 3.5 billion years old. Is this biology?.

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Features of Life

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  1. Features of Life

  2. Biology • Defined: the study of life • Organism: anything that can carry on the processes of life • Species: organisms that can create fertile offspring • Over 2 million known species • More diverse along equator • Oldest life (bacteria) = 3.5 billion years old

  3. Is this biology?

  4. Is this biology?

  5. Is this biology?

  6. Is this biology?

  7. Is this biology?

  8. Is this biology?

  9. Is this biology?

  10. Is Fire Alive? • Made of cells 2) Reproduces 3) Grows and Develops 4) Has organization 5) Requires energy 6) Responds to environment no yes yes no yes So are fires alive? No! yes

  11. Are Cars Alive? yes • Made of cells 2) Reproduces 3) Grows and Develops 4) Has organization 5) Requires energy 6) Responds to environment no no yes So are cars alive? No! yes yes

  12. Life Characteristics • All life has a few common characteristics 1) Made from cells • Cell = most basic unit of life capable of carrying on life processes • Cells are specialized for specific duties • Ex: Red blood cells carry O2

  13. Life Characteristics 2) Requires energy • Energy = ability to do work or cause change • Energy controls metabolism (ability to break down materials) • Energy obtained from the sun • Autotrophs: create sugars directly from the sun • Photosynthetic organisms (plants & algae) • Heterotrophs: consumer others for energy • Can’t performs photosynthesis (ex: fungi & animals)

  14. Life Characteristics !*%!?%&# 3) Responds to environment • Stimulus = environmental factors • Stimulus examples: Sound, light, touch

  15. Life Characteristics • 4) Reproduces and develops • Genetic material (DNA) passed to next generation Types of Reproduction a) Asexual reproduction: • Genetically identical offspring produced from a single parent • Ex: bacteria, protista, some plants & animals b) Sexual reproduction: • Offspring is a genetic mixture of two parents • Ex: Most fungi, plants, animals

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