Part 2 of 3
Naming with a key
identify
Try it yourself
identify: name or select.
Use the six-tree key. A leaf is one blade, has no spines on the edge, and its lobes run along both sides of the midrib. Which tree is it?
| Pair | Statement | Go to |
|---|---|---|
| 1 | Leaf divided into separate leaflets | 2 |
| Leaf is one blade | 3 | |
| 2 | Leaflets spread from one point at the end of the stalk | horse chestnut |
| Leaflets in pairs along the stalk, with one at the tip | ash | |
| 3 | Sharp spines on the edge of the leaf | holly |
| No spines on the edge | 4 | |
| 4 | Lobes along both sides of the midrib | oak |
| Lobes spreading from one point | 5 | |
| 5 | Lobes with small teeth on the edge | sycamore |
| Lobes with a smooth edge | field maple |
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Scope and sources
Cambridge IGCSE Biology 0610 · 2026–2028 v3 · Original learning materials.
The seven characteristics of living organisms (1.1.1) in the reading and practice; classifying organisms by the features they share (1.2.1), species (1.2.2) and the binomial system (1.2.3) in the reading, the practice and the genus step of the experiment; using and constructing dichotomous keys based on identifiable features (1.2.4) through the leaf-key experiment; classification and evolutionary relationships (Supplement 1.2.5), DNA base sequences in classification (Supplement 1.2.6) and more similar sequences for a more recent common ancestor (Supplement 1.2.7) through the DNA step. The DNA strips in the experiment are illustrative.
Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.
Official Cambridge syllabus