Cell and organelle identification in micrographs depends on membrane patterns, internal architecture, scale, location, and combinations of features rather than isolated visual resemblance.
Coverage 2013–2018 · Updated 15 Jul 2026
Identify a cell or organelle in a micrograph by combining visible structures, scale and context; never rely on outline alone.
| Target | Useful visible cues |
|---|---|
| Prokaryote | Nucleoid region, prokaryotic wall, small size, ribosome-rich cytoplasm, no nucleus |
| Plant cell | Cell wall, chloroplasts where present, large sap vacuole |
| Animal cell | Plasma membrane without a cell wall; nucleus and other organelles where visible |
| Organelles | Nucleus/chromosomes, mitochondrion, chloroplast, Golgi, rough or smooth ER, ribosomes, vacuole, microvilli |
First read the scale bar, then identify boundaries, then require at least two compatible features. Section angle can hide organelles, so state uncertainty when evidence is incomplete.
A double-membrane organelle with internal cristae is a mitochondrion; a thick wall plus chloroplasts and a sap vacuole supports a plant cell.
Absence from one section is not proof that the whole cell lacks a structure. Use only what the micrograph and scale can support.
This objective is assessed through structured response, commonly using Identify / Determine / State.
Identify / Determine / State / Outline
Build the answer around this relationship: Internal membrane patterns provide strong evidence for organelle identity.
Naming an organelle from general shape without checking its membrane or internal pattern.
Representative question
Identify organelles I to III.
I:
II:
III:
The SL core is a practical chain. First, understand cells as structural and functional units. Then use microscopes correctly: prepare, stain, calibrate, measure, and choose a method based on resolution and the detail needed. Finally, identify cell types from visible evidence and draw only what the micrograph shows. This is how the topic turns from definitions into exam performance.
