AQA GCSE Biology · 8461
Specification 4.1.1.2 · Paper 1
Revise: Microscopy Practical and Size EstimationA scale bar must be a sensible size relative to the drawing and must accurately represent its stated distance.
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GCSE Biology · key term
A labelled line on an image whose length represents a stated real distance in the specimen.
Used by AQA, Edexcel and OCR
Specification 4.1.1.2 · Paper 1
Revise: Microscopy Practical and Size EstimationA scale bar must be a sensible size relative to the drawing and must accurately represent its stated distance.
Specification 1.4, 1.6 · Paper 1, Paper 2
A line on an image whose labelled length represents a known actual distance in the specimen.
Revise: Number, Size and ScaleA scale bar is particularly useful because it changes size with the image when the image is enlarged or reduced. Compare the length of the specimen with the scale bar, then use the labelled real length of the bar to infer the specimen's actual size.
A measured line on an image or drawing that represents a stated real distance in the specimen.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A line on an image that represents a stated real distance in the specimen.
Revise: Cells and MicroscopyRecord the total magnification or include a suitable scale bar. Magnification reports how many times larger the image appears; a scale bar directly represents a real distance in the specimen. These details allow someone else to interpret the size of the cells rather than seeing only an unscaled picture.
When comparing structures in different images, check the magnification or scale bars first. Apparent image size alone does not show real size.
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