Zadanie 1a, Paper 2, maj 2024, TZ2, Biologia IB HL
Wzorowane na: Biology HL Paper 2, May 2024, TZ2, pytanie 1(a). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Zadanie
Wspólne informacje do wiązki zadań
A constructed long-term study follows three hypothetical species of large, long-lived oceanic seabirds, A, B and C. They use wind while searching for prey and breed on the same island. They can be killed accidentally in fishing gear, and changes to food webs or climate may affect them.
The first dataset gives annual breeding-pair counts for 22 years.
The next dataset gives annual survival for species A and B over 31 years. Annual survival is the percentage of adults alive at the start of a year that remain alive at its end; it excludes recruitment.
Fishing effort indicates the intensity of fishing activity. The graph pairs it with survival in species A.
Small crustaceans are important prey directly or indirectly for these birds. The final graph compares prey density and species B survival at six survey dates.
A further study of species C reports these effects.
| Variable | Total eggs laid in the colony | Percentage of chicks surviving |
|---|---|---|
| Wind conditions depart from the optimum | No significant effect | Negative effect |
| Number of breeding pairs increases | Positive effect | No significant effect |
Polecenie
(i) Suggest a change at a lower trophic level that could reduce survival of these birds.
(ii) Suggest how climate change could affect their survival.
Korepetytor AI
Nie wiesz, jak ruszyć? Korepetytor zna to zadanie i poprowadzi Cię krok po kroku, bez gotowca.
3 rozmowy · bez karty · Zaloguj się
Sprawdź się
Odpowiedz i oceń, jak poszło. Klucz odsłoń dopiero, gdy masz swoją odpowiedź.
Jak poszło Ci z tym zadaniem?
Wybierz ocenę: zapamięta ją ta przeglądarka, a z darmowym kontem zobaczysz ją na każdym urządzeniu.
Pokaż rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
(i) A reduction in producers, prey or energy transferred up the food web could reduce their food supply. ✔
(ii) Warming or acidification could change prey availability; alternatively, altered climate could reduce suitable breeding or resting habitat. ✔
Schemat punktowania
Award 1 per part; maximum 2. A climate suggestion must link the change to food availability or habitat, rather than simply saying the birds cannot adapt.