Moldy Bread Higher Example

Moldy Bread Higher Example
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Experiments Lesson Plans

Teach Students the Design of Experiments

By Oliver Smith

Teaching experimental design and letting students develop their own questions and hypotheses takes time. These materials have been created to scaffold and structure the process to allow teachers to focus on improving the key ideas in experimental design. Allowing students to ask their own questions, write their own hypotheses, and plan and carry out their own investigations is a valuable experience for them. This will lead to students having more ownership of their work.




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Storyboard Description

Experimental Design - completed planning worksheet

Storyboard Text

  • Question-Whatdoyouwanttofindout?
  • ExplanationofHypothesis
  • Howdoestemperatureaffectmoldgrowthonbread?
  • Moldisalivingorganism.Thechemicalreactionsthatkeepthemold aliveareaffectedbytemperature.Whenweincreasethetemperature, thespeedofthesechemicalreactionsincreases.Therefore,ifwe increasethetemperature,moremoldshouldgrowonthebread.
  • Hypothesis
  • Prediction
  • IfIincreasethetemperature,thenmoldwillgrowmore quicklyonthebread.
  • Thepieceofbreadkeptinthewarmestlocationwill havethemostmoldgrowth.
  • IndependentVariable
  • Whatisyourrange?Howmanytimeswillyourepeatthetest?
  • Thetemperatureofstoragespace
  • Therewillbe2differenttemperatures: Refrigeratortemperature40°F(4°C) Roomtemperature73°F(23°C). Iwillrepeattheexperiment3timesateach temperature.
  • Howwillyoumeasureyourdependentvariable?
  • DependentVariable
  • Theamountofmoldonthebread
  • UsingatransparentgridIwillcalculatethe areaofthebreadwhichiscoveredinmold.
  • ControlledVariables
  • Howwillyoukeepthemconstant?
  • 1.Amountoflight 2.Exposuretoair 3.Typeofbread 4.Sizeofbreadslice
  • 1.Allthebreadsliceswillbeputinpaperbagsso theyareallinthedark. 2.Allthebreadsliceswillbeputinplasticbags. 3.Allthebreadsliceswillbetakenfromthesame loaf. 4.Breadsliceswillbechosenthatarethesamesize.
  • Riskasssessment
  • Howcantheserisksbemanaged?
  • Youcouldhaveanallergicreactiontomold. Youcouldinhalethemold.
  • Ifyouareallergictomolddon'ttakepartin theexperiment. Donotopenthebagsattheendofthe experimentanddisposeofthemcarefully.
  • Diagram
  • Materials-Whatdoyouneedto completethisexperiment?Why?
  • •6slicesofbreadthatarethesamesize •Arefrigerator-keptataconstanttemperature •Awarmplace-keptataconstanttemperature •6plasticbags-tokeepthebreadinandstopthe moldgettingout •6paperbags-tokeepthesunlightout •Aruler-tomeasurethemoldspots •Atransparentgrid-tohelpworkouttheareaof breadthatiscoveredinmold •Amarker-tolabelthebags
  • Plan-Howareyougoingtocarryitoutsafely?
  • 1.Usethemarkerpentolabelthe6bagssotheycanbeidentifiedeasilylater.Placeasliceof breadineachbag. 2.Putthebagsinsidepaperbagsandput3intothefridgeand3inacloset. 3.Leavethebagsfor2days. 4.Checkthebagseverydayandrecordhowmuchofthesurfaceareaiscoveredinmold.This canbedoneusingatransparentgrid. 5.Recordyourresultsinatable. 6.Donotopenthebagsanddisposeofthemcarefullyintothetrash.
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