Zadanie 1d, Paper 2, listopad 2023, TZ2, Biologia IB SL
Wzorowane na: Biology SL Paper 2, November 2023, TZ2, pytanie 1(d). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
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Zadanie
Polecenie
Informacja do zadań 1 a-1 f.
The following datasets are hypothetical models of a severe wildfire season in a coastal region. Fires were particularly widespread from November to January. Five independent programmes estimate the carbon dioxide released during these three months.
Powiększ| Comparison | CO₂ emissions / Tg |
|---|---|
| Typical annual wildfire emissions across the entire country | 440 |
| Typical annual fossil-fuel emissions across the entire country | 420 |
| Typical November–January wildfire emissions in the study region | 12 |
| Mean of five estimates for the exceptional season in the study region | 730 |
Smoke contains airborne particles and droplets, including soot and compounds containing nitrogen, phosphorus and iron. Winds carry this aerosol over an adjacent ocean study area. Aerosol optical density (AOD) measures its effect on transmitted light. Water chlorophyll concentration is proportional to phytoplankton abundance.
PowiększAt a downwind air-sampling station, filters are analysed for iron and levoglucosan. Levoglucosan forms when plant carbohydrates burn and therefore acts as a tracer of biomass combustion.
PowiększZadanie 1 d.
Distinguish phytoplankton abundance in the exceptional season from the earlier-year pattern.
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Odpowiedź z klucza
In November–January the current pattern rises or remains elevated while the earlier-year pattern falls. ✔
The current concentration is higher during the fire-season months. ✔
The current pattern fluctuates more, whereas the earlier-year pattern is smoother. ✔
A valid numerical comparison, for example about 0.30 mgm⁻³ versus 0.096 mgm⁻³ near the January peak. ✔
Schemat punktowania
Award any 3, maximum 3. For the first point both directions are needed. Accept a correct quantitative comparison read from the curves.