9700_y16_sy

Cambridge International AS and A Level Biology 9700 syllabus Practical assessment
Interpreting data or observations and identifying sources of error
These activities use results from observations using a light microscope, prepared slides and
photomicrographs.
Candidates should be able to:
• Calculate the correct answer with the correct number of significant figures, using quantitative results or
provided data including:
– the calibration of the eyepiece graticule scale
– the actual size of a specimen (using a calibrated eyepiece graticule, a magnification or a scale bar)
– the magnification of a specimen
– the number in a field of view, e.g. number of stomata per unit of area
• Compare observable features of specimens of biological material including similarities and differences
between microscopic slides of specimens and photomicrographs of specimens.
Drawing conclusions
This strand uses observations using a light microscope, prepared slides and photomicrographs.
Candidates should be able to:
• Using the skills, knowledge and understanding acquired from the AS Level Biology syllabus make
scientific explanations of:
– observations of specimens
– calculated values
– how a specimen is adapted for a particular habitat.
Suggesting improvements or modifications to extend an investigation
These activities use results of observations using a light microscope, prepared slides and photomicrographs.
Candidates should be able to:
• Suggest improvements to a procedure that will increase the accuracy of the observations that can be
made, to include how to:
– use a measurement method which uses smaller intervals to improve accuracy and precision
– collect more data by taking replicate results to obtain a mean.
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www.cie.org.uk/alevel
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