Practical Guide Biology Photosynthesis This resource is strictly for the use of member schools for as long as they remain members of The PiXL Club It may not be copied sold nor transferred to a third party or used by the school after membership ceases Until such time it may be freely used with ID: 778361
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Practical GuideBiologyPhotosynthesis
This resource is strictly for the use of member schools for as long as they remain members of The PiXL Club. It may not be copied, sold nor transferred to a third party or used by the school after membership ceases. Until such time it may be freely used within the member school.
All opinions and contributions are those of the authors. The contents of this resource are not connected with nor endorsed by any other company, organisation or institution.
www.pixl.org.uk The PiXL Club Ltd, Company number 07321607
© Copyright The PiXL Club Ltd, 2016
Commissioned by The PiXL Club Ltd. November 2016
This document contains:
Links to YouTube clips showing the practical procedure
Information from examination boards AQA, OCR,
Edexcel
Potential examination questions and answers
Slide2AQARequired practical – exam boards
Slide3Practical procedure: PhotosynthesisVideo 1Video 2
Slide4Possible examination style questionsA student carried out an investigation into the effect of light intensity on the rate of photosynthesis. Plot a graph of the results:Describe how a student would use the equipment in the diagram to gather this data.Describe and explain the pattern in the data.Identify 2 sources of possible error with the collection of data in this manner. Suggest improvements.Distance from lamp/ cm10203040506070Number of bubbles of gas per min82432012862
Slide5Possible examination style questions answersANS: Appropriate scalesLabels on axesPoints plotted correctlySuitable line of best fit Plot a graph of the results.
Slide6ANS: Equipment set up at suggested distance e.g. 10cm from lampTime for pondweed to acclimatiseCount number of bubbles produced in a minuteRepeat at different distances outlined in tablePossible examination style questions answersDescribe how a student would use the equipment in the diagram to gather this data.
Slide7ANS:Increasing distance from lamp decrease the number of bubblesDramatic decrease between 10-20cm from lampIncrease distance from lamp decreases light intensityDecreasing light intensity leads to a decrease in rate of photosynthesisDescribe and explain the pattern in the data.Possible examination style questions answers
Slide8ANS:Lamp producing heat as well as lightPlace beaker of water in between the light source and pondweedMiscounting bubblesRepeats to reduce impact of outliersAny sensibleIdentify 2 sources of possible error with the collection of data in this manner.Possible examination style questions answers
Slide9Key questions:How can light intensity be measured?How can light intensity be calculated?What is the optimum temperature for this investigation?What are the other variables that need to be controlled during the investigation?Why does algae work better than pondweed in this type of investigation?What are the benefits of using immobilised algae?Why does the rate of photosynthesis lead to a colour change in the indicator solution?Why is a tube of water placed between the light source and the tubes of indicator containing the algal balls?Why is a set of standard solutions used?http://qualifications.pearson.com/content/dam/pdf/GCSE/Science/2016/teaching-and-learning-materials/GCSE-9-1-Sciences-core-practical-guide.pdf
Slide10Summary documentA summary document is also available on Huddle which contains all the relevant information about this practical from the different examination boards. This document includes practical methods and other potential examination questions