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    Biology ppt Biology ppt Presentation Transcript

    • Biology
      The Dynamics of Life
    • Biology
      “The Study of Life”
    • Characteristics of “LIFE”
      Growth & Development
      Respond to its environment
      (Homeostasis – The ability to control its internal environment. Adjustment of water & minerals in an organism to achieve balance.)
    • Observations
      A scientist uses his senses of sight, touch, hearing, and smell to examine an object in detail. He may use instruments to extend these senses.
      Qualitative observations DESCRIBE = descriptions such as color, odor, sound, and texture (using the senses).
      Quantitative observations MEASURE = using an instrument of measurement to measure the amount or number.
    • Observations
      A scientist improves his skills of observation and his communication skills by practice.
      Observe the following and describe as much as you can.
      Accident #1
      Accident #2
      Accident #3
    • The Scientific MethodOVERVIEW
      Identify a PROBLEM to solve.
      Make a HYPOTHESIS.
      TEST the hypothesis and COLLECTDATA. (a controlled experiment)
      PUBLISH the results.
      Draw a CONCLUSION and [perhaps] develop a THEORY.
    • 1. OBSERVATION leads to identifying a problemto solve.
      “Observing the world around you is the foundation of scientific investigation.”
    • 2. Making a HYPOTHESIS.
      an EXPLANATION for a question or problem that can be formally TESTED.
      Not a RANDOM GUESS.
    • 3. Collecting DATA. (numbers)
      Test the hypothesis in a controlled EXPERIMENT can be used to obtain data to test a HYPOTHESIS.
    • 4. PUBLISH results
      allows other scientists to repeat the experiment and VERIFY the results.
    • 4. Forming a THEORY.
      A THEORY is a hypothesis that is supported by a LARGE body of scientific evidence.
      (not an unproven idea or hunch)
    • Also
      6. Developing new HYPOTHESES.
      7. Revising the THEORY.
    • The Scientific MethodREVIEW
      Identify a PROBLEM to solve.
      Make a HYPOTHESIS.
      TEST the hypothesis and COLLECTDATA. (a controlled experiment)
      PUBLISH the results.
      Draw a CONCLUSION and [perhaps] develop a THEORY.
    • Parts of a Controlled Experiment
      Control – the STANDARD against which the results of the experiment are COMPARED.
      INDEPENDENT Variable (I.V.) – the condition that is tested because it affects the outcome of the experiment.
      DEPENDENT Variable (D.V.) – the condition in an experiment that results from the changes made to the independent variable.
      CONSTANTS – the conditions that remainthesame in all of the experimental groups.
    • Francesco Redi’s Experiment
      Observed – Maggots appeared on meat a few days after flies were present
    • Francesco Redi’s Experiment
      Prediction – Flies produced maggots and keeping flies away from meat would prevent the appearance of maggots.
    • Francesco Redi’s Experiment
      Hypothesis - IF the gauze covering keeps flies away from the meat, THEN no maggots will appear.
    • Francesco Redi’s Experiment
      Independent variable - gauze covering that keeps flies away from meat.
    • Francesco Redi’s Experiment
      Dependent variable - whether maggots appear on the meat.
    • Francesco Redi’s Experiment
      Controlled variables - Jars, type of meat, location, temperature, time.
    • Francesco Redi’s Experiment
      Data - showed that maggots appeared on the meat without gauze – but not on covered jars.
    • Francesco Redi’s Experiment
      Conclusion - Maggots formed only when flies came into contact with the meat. Not spontaneous generation.