Biology ppt


Published on

Published in: Technology
1 Comment
  • Transportation
    Are you sure you want to  Yes  No
    Your message goes here
  • Be the first to like this

No Downloads
Total views
On SlideShare
From Embeds
Number of Embeds
Embeds 0
No embeds

No notes for slide

Biology ppt

  1. 1. Biology<br />The Dynamics of Life<br />
  2. 2. Biology<br />“The Study of Life”<br />
  3. 3. Characteristics of “LIFE”<br />Organization<br />Reproduction <br />Growth & Development <br />Respond to its environment<br />Stimulus<br />Response<br />(Homeostasis – The ability to control its internal environment. Adjustment of water & minerals in an organism to achieve balance.) <br />
  4. 4. Observations<br />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.<br />Qualitative observations DESCRIBE = descriptions such as color, odor, sound, and texture (using the senses).<br />Quantitative observations MEASURE = using an instrument of measurement to measure the amount or number.<br />
  5. 5. Observations<br />A scientist improves his skills of observation and his communication skills by practice.<br />Observe the following and describe as much as you can.<br />Accident #1<br />Accident #2<br />Accident #3<br />
  6. 6. The Scientific MethodOVERVIEW<br />Identify a PROBLEM to solve.<br />Make a HYPOTHESIS.<br />TEST the hypothesis and COLLECTDATA. (a controlled experiment)<br />PUBLISH the results.<br />Draw a CONCLUSION and [perhaps] develop a THEORY.<br />
  7. 7. 1. OBSERVATION leads to identifying a problemto solve.<br />“Observing the world around you is the foundation of scientific investigation.”<br />
  8. 8. 2. Making a HYPOTHESIS.<br /> an EXPLANATION for a question or problem that can be formally TESTED.<br />Not a RANDOM GUESS.<br />
  9. 9. 3. Collecting DATA. (numbers)<br /> Test the hypothesis in a controlled EXPERIMENT can be used to obtain data to test a HYPOTHESIS.<br />
  10. 10. 4. PUBLISH results<br /> allows other scientists to repeat the experiment and VERIFY the results.<br />
  11. 11. 4. Forming a THEORY.<br /> A THEORY is a hypothesis that is supported by a LARGE body of scientific evidence. <br />(not an unproven idea or hunch)<br />
  12. 12. Also<br /> 6. Developing new HYPOTHESES.<br /> 7. Revising the THEORY.<br />
  13. 13. The Scientific MethodREVIEW<br />Identify a PROBLEM to solve.<br />Make a HYPOTHESIS.<br />TEST the hypothesis and COLLECTDATA. (a controlled experiment)<br />PUBLISH the results.<br />Draw a CONCLUSION and [perhaps] develop a THEORY.<br />
  14. 14. Parts of a Controlled Experiment<br />Control – the STANDARD against which the results of the experiment are COMPARED.<br />INDEPENDENT Variable (I.V.) – the condition that is tested because it affects the outcome of the experiment.<br />DEPENDENT Variable (D.V.) – the condition in an experiment that results from the changes made to the independent variable.<br />CONSTANTS – the conditions that remainthesame in all of the experimental groups.<br />
  15. 15. Francesco Redi’s Experiment<br />Observed – Maggots appeared on meat a few days after flies were present<br />
  16. 16. Francesco Redi’s Experiment<br />Prediction – Flies produced maggots and keeping flies away from meat would prevent the appearance of maggots.<br />
  17. 17. Francesco Redi’s Experiment<br />Hypothesis - IF the gauze covering keeps flies away from the meat, THEN no maggots will appear.<br />
  18. 18. Francesco Redi’s Experiment<br />Independent variable - gauze covering that keeps flies away from meat.<br />
  19. 19. Francesco Redi’s Experiment<br />Dependent variable - whether maggots appear on the meat.<br />
  20. 20. Francesco Redi’s Experiment<br />Controlled variables - Jars, type of meat, location, temperature, time.<br />
  21. 21. Francesco Redi’s Experiment<br />Data - showed that maggots appeared on the meat without gauze – but not on covered jars.<br />
  22. 22. Francesco Redi’s Experiment<br />Conclusion - Maggots formed only when flies came into contact with the meat. Not spontaneous generation.<br />