Zadanie 1c, Paper 2, maj 2026, TZ2, Biologia IB SL
Wzorowane na: Biology SL Paper 2, May 2026, TZ2, pytanie 1(c). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
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Zadanie
Wspólne informacje do wiązki zadań
An invented regional woodland programme releases captive-bred quail. The first graph indexes annual releases relative to 1964 and shows 95% confidence intervals. In 1964, 3.60 million birds were released.
A formerly persecuted hawk has been reintroduced; several hundred pairs now breed in the region. Prey remains near nests give the second model dataset. Squirrels strip tree bark, doves eat seeds, corvids may eat quail eggs, rabbits eat leaves and bark, and the other birds have mixed plant/invertebrate diets.
A separate survey examines 280 young beech trees. Larger trunk diameter generally indicates an older tree. Ring-barking removes a complete band of bark and can kill the leading shoot.
| Trunk diameter / mm | Trees sampled | Damage below 2 m | Damage at 2–5 m | Damage above 5 m | Ring-barked above 5 m |
|---|---|---|---|---|---|
| 30–54 | 58 | 0 | 0 | 0 | 0 |
| 55–79 | 84 | 0 | 1 | 2 | 0 |
| 80–104 | 73 | 0 | 2 | 18 | 2 |
| 105–129 | 48 | 0 | 4 | 29 | 8 |
| 130–154 | 15 | 0 | 0 | 13 | 3 |
| 155–179 | 2 | 0 | 0 | 2 | 1 |
Polecenie
Evaluate the hypothesis that mammals make up the largest part of the hawks’ diet.
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Odpowiedź z klucza
Support: mammals form the majority of counted remains; numerical support may use 75/120 (62.5%) mammals versus 42/120 (35%) birds. ✔
Support: squirrels are the most frequent single category and are mammals. ✔
Limitation: only two mammal species/categories are represented, whereas birds include more species. ✔
Limitation: prey size, season, sampling period or replication could change the conclusion. ✔
Limitation: some remains might come from other predators. ✔
Schemat punktowania
Award any 3 listed points, with at most 2 limitations, maximum 3. Distinguish numerical abundance from biomass or species richness.