A great guide for science control assessments

If you are doing the OCR 21st century board, this is a great guide on how to structure your control assessments and how to hit the high marks. Even if your science board isn't the same, this still could be useful :)

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Science Controlled Assessment
Investigating how different
factors affect the rate of
osmosis in plant cells…read more

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Glossary of terms…read more

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· You are going to carry out an investigation of a factor that affects
the movement of water or dissolved substances into and out of
plant cells.
Useful Websites
· www.bitesize.com
· http://highered.mcgraw hill.
· http://science-resources.co.
The Controlled Assessment is marked according to 5 strands. You are
given a score out of 64.
Mark Grade
60 A*
54 A
47 B
41 C
34 D
28 E
22 F
16 G
Remember to use your mark scheme and that you have to complete all
the requirements in the box gaining 1-2 marks before you are able to
gain 3 ­ 4 marks and so on. It is marked cumulatively.…read more

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All investigations MUST have:
Prediction ­ based on scientific ideas.
Independent variable ­ what you are changing.
Dependent variable ­ what you are measuring.
Control variables ­ variables that need to be kept the same and why.
Safety ­ hazards and precautions identified.
Equipment list ­ why you are using each piece of equipment.
Method ­ explaining your chosen method.
A range with a least 5 values ­ why have you chosen that range.
Table ­ straight lines, numbers to the same decimal points, units.
Graph ­ labelled axis, even scale, correct line of best fit, range bars.
Evaluation ­ problems with techniques + equipment, improvements.
Outliers ­ correctly identified and discussed. Small/large range bars.
Review data­ comparison of own results with secondary data.
Review prediction ­review your confidence in your prediction.…read more

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Strategy (Strand S)
You will be assessed for Quality of Written Communication. Good range of
punctuation and good use of scientific terms.
· Make a testable prediction that is supported by scientific knowledge.
· Consider all the control variables and explain how each variable could
change the experiment.
· Choose an independent and dependent variable. To gain the highest
marks ­ make your prediction qualitative (use words such as `doubles,
`As the temperature of the hydrogen peroxide doubles, the rate of
reaction will double.'
List your equipment and explain why you are using that piece of
` I am using a measuring cylinder instead of a beaker because this will give
more accurate readings'.
· Describe your method and again explain why you are doing it one way as
opposed to another way.
" I am crushing up all the peas because this will allow the enzyme to
· Identify hazards and precautions. Make a table.
· Explain your ranges. Why might have you gone up in 0.5M concentration?
` I have chosen these ranges because in our preliminary we discovered...'…read more

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Collecting data (Strand C)
Collect and correctly record data to a high quality. Are your results
what you expected? If your data is high quality, your repeats should
be close together.
Identify outliers and do not include in
the average.…read more

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This is really helpful, helped me with all my revision notes... NOW LETS HOPE EXAM GOES WELL #fingerscrossed

lisa linsdell


A useful resource to help work through the OCR full investigation coursework. Gives the marking criteria as well as a couple of good web sites. I especially like the glossary of terms that can be used during the writing up of the practical.



Is this good for OCR Gateway too?



This is the best website going for revision, i love you creater of this website

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