| Answer | % Correct |
|---|---|
| Silver birch | 89%
|
| Alder-leaf birch | 56%
|
| Black alder | 44%
|
| Canoe birch | 44%
|
| Moor birch | 44%
|
| Common hornbeam | 33%
|
| Hazel-hornbeam | 33%
|
| Common hazel | 22%
|
| Hop-hornbeam | 11%
|
| Filbert | 0%
|