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GCSE Biology · key term
The area of a slice or surface viewed across an object; for a circular bacterial culture or clear zone, it is calculated using .
Used by AQA, Edexcel and OCR
Specification 4.1.1.6 · Paper 1
The area of a flat slice through an object; for an approximately circular colony or clear zone, it can be estimated using .
Revise: Investigating Antiseptics & AntibioticsThe same calculation can be used for the cross-sectional area of an approximately circular bacterial colony.
Specification 5.19B · Paper 1
The two-dimensional area occupied by a bacterial colony or a clear region of agar when viewed from above.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
The area of a surface exposed by cutting through an object, or the area seen when it is viewed in cross-section.
Revise: Calculating AreasViewed from above, a circular bacterial culture or clear zone has a cross-sectional area: the amount of the agar surface enclosed by the circle.
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