Zadanie 1b, Paper 2, maj 2024, TZ1, Biologia IB HL
Wzorowane na: Biology HL Paper 2, May 2024, TZ1, pytanie 1(b). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
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Zadanie
Wspólne informacje do wiązki zadań
A hypothetical grassland investigation examines how herbivorous field mice affect runner grasses and tall tussock grasses. The mice normally obtain food from one of the grass types. Replicated plots were monitored with mice present or excluded. The first dataset gives mean biomass from 2006 to 2010. Error bars throughout show standard deviations.
PowiększA later experiment measured change in the volume occupied by one tussock-grass species over two growing seasons.
PowiększPredatory birds that hunt small rodents from vegetation visited the later study but were absent during the first experiment. Fifteen plots were surveyed for vegetation cover and bird visits.
PowiększIn another month-long experiment, predators had access to all plots. Researchers measured changes in tussock-grass root biomass and plant volume with and without mice.
Powiększ
PowiększFinally, plots contained three levels of tussock-grass cover as well as the plants normally eaten by the mice. Birds could visit freely. Feeding frequency and mouse mortality were recorded over three weeks.
Powiększ
PowiększPolecenie
Compare and contrast the mean biomasses of the two grass types in 2006, considering both mouse treatments.
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Odpowiedź z klucza
Without mice, the two grass types have similar means (72 and 78 g m⁻²), with overlapping variation. ✔
With mice, tussock grass has much more biomass than runner grass (69 versus 14 g m⁻²). ✔
Mouse presence is associated with a much larger reduction in runner grass than in tussock grass. ✔
Schemat punktowania
Award any 2 distinct comparisons; maximum 2. A difference between treatment effects must refer to both grass types. Do not infer statistical significance from overlap alone.