Zadanie 5a
A farmer considers an insecticide that kills a wide range of insect species. Suggest one disadvantage compared with a narrowly targeted insecticide.
Increasing pollutant concentrations along food chains
Explain how persistent substances such as mercury or DDT become concentrated in higher-level consumers.
Tę umiejętność sprawdza 9 zadań wzorowanych na arkuszach IB z lat 2023–2025.
Zadania sprawdzające tę umiejętność: 9 Otwórz w wyszukiwarce z filtrami
Zadanie 5b
A model aquatic chain has the following tissue concentrations of a persistent insecticide. Microalgae → herbivorous zooplankton → small fish → fish-eating birds 0.03 ppm →0.36 ppm →2.4 ppm →19.2 ppm (i) Identify the trophic role of the small fish. (ii) Explain…
Zadanie 13b
Some pesticides persist after application. Outline environmental effects of DDT.
Zadanie 15
Methylmercury can occur at harmful concentrations in fish eaten by humans. Explain how such concentrations can develop in the food supply.
Zadanie 16b
Outline how a persistent chemical from the spill could become biomagnified in a marine food chain.
- Materiał graficzny
Zadanie 15
Plastic debris reaches a coastal ecosystem from several human activities. Explain consequences of plastic pollution for marine life.
Zadanie 16b
A constructed marine survey compares hydrophobic PCB pollutants in organisms. Error bars represent variability among samples. Explain why PCB concentrations can become much greater at higher trophic levels.
- Materiał graficzny
Zadanie 13a
Identify the additive with the greater concentration in (i) the body wall and (ii) the gut wall.
- Materiał graficzny
Zadanie 13b
Explain how biomagnification of additive B through this food web could affect human health.
- Materiał graficzny