Zadanie 1i, Paper 2, maj 2024, TZ1, Biologia IB HL
Wzorowane na: Biology HL Paper 2, May 2024, TZ1, pytanie 1(i). 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.
A later experiment measured change in the volume occupied by one tussock-grass species over two growing seasons.
Predatory 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.
Finally, 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.
Polecenie
Suggest a reason for a change in tussock-grass volume in the month-long experiment.
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Odpowiedź z klucza
Without mice, continued growth and photosynthesis can increase plant volume. ✔
With mice, damage to roots or other plant tissues can reduce plant growth or survival and hence volume. ✔
Schemat punktowania
Award 1 for either a biologically plausible increase or decrease explanation linked to the relevant treatment. The data do not establish that the mice gain nutrition from tussock grass.