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It’s Alive

Explore the fundamental characteristics and needs of living organisms, including cellular organization, chemical composition, response to stimuli, growth and development, and reproduction. Discover the importance of water, food, living space, and homeostasis in maintaining life.

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It’s Alive

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  1. It’s Alive

  2. 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

  3. 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

  4. 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

  5. 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)

  6. 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.

  7. 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

  8. 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

  9. 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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