It s alive
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It’s Alive PowerPoint PPT Presentation


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It’s Alive. What is Life?. An Organism is a living thing. All living things have: Cellular organization Contain certain chemicals Respond to surroundings Grow and develop Reproduce. Characteristics of Life- Cells. Unicellular- single celled organisms

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It’s Alive

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It s alive

It’s Alive


It s alive

What is Life?

  • An Organism is a living thing.

  • All living things have:

    • Cellular organization

    • Contain certain chemicals

    • Respond to surroundings

    • Grow and develop

    • Reproduce


It s alive

Characteristics of Life-

Cells

  • Unicellular- single celled organisms

  • Multicellular- many cells and they specialize to perform certain task.

  • Cell is the basic unit of structure and function of an organism.

    • Prokaryotic- cells with no true nucleus.

    • Eukaryotic-cells with a nucleus


It s alive

Characteristics of Life-

Chemistry

  • Cells are composed of chemicals

  • Water is the most abundant

  • Carbohydrates are the main source of energy

  • Cells also need proteins, lipids, and nucleic acids


It s alive

Characteristics of Life-

Energy and Stimuli

  • Cells need energy for growth and repair of injured parts.

  • A change in an organism’s surroundings that causes a reaction is a stimulus.

  • Tropism- a response to a stimuli ( phototropism, thermal tropism, auditory tropism, gravitational tropism)


It s alive

Characteristics of Life-

Development/Reproduction

  • Development is the process of change that occurs during an organism’s life to produce a more complex organism.

  • Reproduction is the ability to reproduce(sexually or asexually), or produce offspring just like you.


It s alive

Life comes from life

  • Spontaneous generation theory- mistaken idea that living things arise from nonliving sources.

  • Redi’s Experiment

  • Louis Pasteur Experiment

  • Death of a Pumpkin experiment


It s alive

Needs of Living Things

  • Water- needed to survive… to break down chemicals, food, grow, move, and reproduce.

  • Food- a source of energy

    • Autotroph vs Heterotrophs


It s alive

Needs of Living Things

  • Living space-Need a place to live and gather needed resources to survive.

  • Stable internal conditions despite the external conditions.

    • Homeostasis


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