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Design an Experiment Essay Questions  Many of the past National AP Biology lab based essay questions have asked students to “Design an experiment to…”

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Presentation on theme: "Design an Experiment Essay Questions  Many of the past National AP Biology lab based essay questions have asked students to “Design an experiment to…”"— Presentation transcript:

1 Design an Experiment Essay Questions  Many of the past National AP Biology lab based essay questions have asked students to “Design an experiment to…”  There are usually some common points in any question of this type. Here are some tips:

2 Common Points  Control – use the word “control”, but also indicate several variables that are being held constant ~controlled variables  ex – “plants of the same species, from the same seed source, grown in the same soil and under the same conditions”.  Be sure to indicate “which treatment” is serving as the control set up.

3 Common Points  Hypothesis – Say the word “hypothesis” and write in the “If….then…” format (weird… like a prediction, but not as specific.)  Example – The hypothesis for this experiment is if higher light allows more photosynthesis, then the plants with the most light should have the most mass.

4 Manipulation of the Variable  Tell how the experiment is manipulated (i.e. what are your treatments). Give a full range of the treatments if possible to AVOID THE “THREE BEARS SYNDROM” (one too hot, one too cold, one just right)  ex. – “The plants will be grown in five treatments of differing temperatures from O o to 40 o in 10 degree intervals.”

5 Measurements  Indicate to the reader what is being measured. Use quantitative measurements rather than qualitative. USE UNITS!!  Tell when then measurements will be taken.  ex. – “The mass of the plants will be taken in grams at the beginning and end of the experiment”.

6 Verification  INDICATE you will use a large sample size (i.e. the “rule of 100X) or show that the experiment will be repeated several times.  ex. – “There will be 100 plants in each treatment and control group.”

7 Expected Results  Tell the reader what you expect the results of the experiment to be and explain why GIVE THE SCIENCE BEHIND THE REASON.  ex. - “The expected results of the experiment are: the plants with more light will undergo more photosynthesis, creating more sugar, therefore, they should have more biomass.”


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