Cambridge O Level Biology · Syllabus 5090 · Cells
Biological drawing
What is Biological drawing?
A record of what is actually observed through a microscope, drawn large with clear single continuous lines, without shading or colour, in realistic proportions and showing only structures that can genuinely be seen. Labels are written horizontally on straight ruled lines that do not cross, and the drawing carries a title, with magnification or scale information when it is requested.
This definition is part of the Cells chapter in Cambridge O Level Biology.
Biological drawing in context
A cell is the smallest structural and functional unit considered in this syllabus. Cell structures are not labels to be memorised in isolation: each one performs work that keeps the cell, and therefore the whole organism, alive. Topic 1 asks you to identify those structures in animal, plant and bacterial cells, to state what each one does, to obtain your own evidence with a light microscope, to record that evidence as a biological drawing, to convert between image size and actual size using magnification, and to explain how specialised cells are built into tissues, organs, organ systems and organisms.