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Glossary of terms…read more

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Background
· 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.
com/sites/0072495855/student_view0/chapter2/animation__how_osm
osis_works.html
· http://science-resources.co.
uk/KS3/Biology/Life_Processes_and_Cells/osmosis.htm
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
*** VERY IMPORTANT***
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)
Sa
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,
halves')
`As the temperature of the hydrogen peroxide doubles, the rate of
reaction will double.'
Sb
List your equipment and explain why you are using that piece of
equipment.
` 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
escape.'
· 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)
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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Comments

Layla

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.

Hxneul._.Chan

Is this good for OCR Gateway too?

swagnut

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

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