1 / 34

Windup Toy

Windup Toy. Alive. Not alive. What is life?. The Characteristics of Living Things. What do you and the grubs in the grass have in common?. Key Concept: All living things…. a) have cell(s) b) contain similar chemicals c) use energy to carry out life activities (metabolism)

evelynjthompson
Download Presentation

Windup Toy

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Windup Toy Alive Not alive

  2. What is life? The Characteristics of Living Things

  3. What do you and the grubs in the grass have in common?

  4. Key Concept: All living things… • a) have cell(s) • b) contain similar chemicals • c) use energy to carry out life activities (metabolism) • d) respond to stimuli • e) grow and develop (…and eventually die! – have a lifespan) • f) reproduce

  5. An organism is a living thing

  6. ACELL IS THE BUILDING BLOCK OF STRUCTURES IN AN ORGANISM

  7. UNICELLULAR ORGANISMS MADE OF ONLY 1 CELL

  8. MULTICELLULAR AN ORGANISM MADE OF MORE THAN ONE CELL EXAMPLES:

  9. Living things contain similar chemicals

  10. for example… – wateris the most abundant chemical in living things- proteins and lipids(fats) are the building materials of cells

  11. Living things use energy

  12. Most living things depend on energy from the sun • Autotroph– an organism that makes its own food in a process called photosynthesis • Heterotroph– an organism that cannot make its own food

  13. Living things react to what happens around them • A stimulus is a change in an organism’s surroundings • A response is an action or behavior an organism takes when it reacts to a stimulus

  14. Growth– getting larger Development– becoming more complex These activities use ENERGY to make new cells Living things grow and develop

  15. Living things produce offspring like oneself in a process called reproduction. • Sexual reproduction – when 2 parent cells are joined to produce offspring • This is how most complex (large, multi-cellular) organisms reproduce • Asexual reproduction – 1 parent produces a new organism • Unicellular (1-celled) organisms generally reproduce this way

  16. LIFE COMES FROM LIFE • Living things arise from living thingsthroughreproduction

  17. 400 years ago people thought that life could arise from non-living matter.

  18. For example, people thought mud turned into frogs and meat turned into flies.

  19. This belief or theory is known asSPONTANEOUS GENERATION

  20. Francesco Rediset up a controlledexperiment to show that rotting meat does not turn into flies!

  21. Louis Pasteuralso conducted experiments in the 1800’s to show that bacteria could only be produced from other bacteria

  22. The work of these scientists helped disprovethe theory of Spontaneous Generation

  23. Today scientists believe that life can only come from another living thing, usually through a process called reproduction. This theory is known as BIOGENESIS

  24. What needs do all living things have?

  25. TheNEEDSof living things: All living things must satisfy their basic needs for… • Water • Food • Living space or shelter • homeostasis

  26. WATER • Dissolves and transports chemicals throughout the body • Regulates body temperature in many animals • Cells are composed mostly of water

  27. Living things need foodto get energy needed for metabolism • Some use sunlight energy to make their own food(autotrophs) • Some cannot make their own food and must feed on other living things(heterotrophs)

  28. All living things need living space Their living space must provide them with • water • food • shelter or protectionfrom the elements or other organisms

  29. HOMEOSTASIS • ORGANISMS MUST BE ABLE TO MAINTAIN A STABLE INTERNAL ENVIRONMENT EVEN WHEN EXTERNAL CONDITIONS CHANGE. • THIS STEADY STATE IS CALLEDHOMEOSTASIS

  30. Some ways that many animals maintain homeostasis are… Shivering when they are cold – to create warmth Sweating when they are hot –to release heat by evaporation

  31. Now…what do you and the grubs have in common???

More Related