1.2.2—Cell images and drawings

Interpreting a plant or animal cell image means using visible evidence to identify plausible structures. A photomicrograph or electron micrograph records a specimen, while a drawing selects and simplifies what is shown.

1. Identify the source: photomicrograph, electron micrograph or drawing, and note any scale bar or magnification.
2. Find the cell boundary and describe observations such as relative size, shape, position, contrast and repeated patterns.
3. Match several clues to a structure: for example, a large dark region may be a nucleus, a folded internal membrane may be a mitochondrion, and a large clear compartment in a plant cell may be a vacuole.
4. Use the whole pattern to distinguish a plant cell from an animal cell, including a wall, chloroplasts or a large vacuole when visible.
5. State the identification as an inference from the evidence; do not add structures that are hidden, unresolved or absent from the drawing.

Several polygonal cells with a regular outer boundary and large clear internal spaces support the inference of plant cells with cell walls and vacuoles. The conclusion is stronger because multiple features agree, not because one shape was memorised.

A mitochondrion is not always cylindrical: section angle and specimen condition can change its appearance. Image resolution, staining, contrast and the drawing convention can hide structures, so distinguish what is visible from what is inferred.