Zadanie 1d, Paper 2, maj 2026, TZ3, Biologia IB SL
Wzorowane na: Biology SL Paper 2, May 2026, TZ3, pytanie 1(d). 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 model pot trial tests root extracts from an invasive vine on basil seedlings. At each of five concentrations, four replicate pots each receive 15 mL daily. The table gives mean measurements after 56 days. The invented dataset is intended to investigate possible chemical effects on plants and soil organisms.
| Extract / mg mL⁻¹ | Shoot height / cm | Root length / cm | Above-ground biomass / g | Total biomass / g |
|---|---|---|---|---|
| 0 (water control) | 18.0 | 14.8 | 21.4 | 32.0 |
| 3 | 21.0 | 13.9 | 20.2 | 30.8 |
| 6 | 19.8 | 14.1 | 18.9 | 28.4 |
| 9 | 17.2 | 13.4 | 18.1 | 29.6 |
| 12 | 16.4 | 12.2 | 15.5 | 23.2 |
A further assay measures microbial activity in treated soil after six days. Bars show means and whiskers indicate uncertainty intervals.
The Simpson reciprocal diversity index is also lower in treated soils than in the control.
Polecenie
Discuss whether these results support the hypothesis that chemical effects on other plants or on soil microbes help an invasive plant establish.
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Pokaż rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
Support: root extracts contain substances released or produced by the vine. ✔
Support: several plant-growth measures decline with increasing extract. ✔
Support: microbial activity also falls overall. ✔
Support: altered microbial activity could change decomposition, nutrient supply, soil osmotic conditions or pH, influencing growth. ✔
Limitation: a small pot trial does not reproduce all field influences, OR replication is limited, OR several uncertainty intervals overlap. ✔
Limitation: natural soils may contain different microbial communities. ✔
Limitation: the lowest dose increases shoot height, OR even the highest dose leaves substantial microbial activity. ✔
Schemat punktowania
Award any 3 points with at most 2 supporting and at most 2 limiting points; maximum 3.