Explain how persistent substances such as mercury or DDT become concentrated in higher-level consumers.
Tę umiejętność sprawdza 10 zadań wzorowanych na arkuszach IB z lat 2023–2026.
A persistent pesticide occurs at the following concentrations along a feeding chain. Water contains 0.000004 ppm. Which inference best explains the pattern? A. A fish must eat exactly 4.29 zooplankton in its lifetime B. The pesticide is removed rapidly and…
Justify why the otter has a higher DDT concentration than either the heron or the pike.
Identify which fish would give the lowest DDT intake per equal mass of lipid consumed, and give a reason.
Outline how persistent mercury compounds can reach high concentrations in organisms.
Some environmental contaminants interfere with biological processes. (a) Describe how a persistent fat-soluble pesticide can become concentrated in predatory birds. (b) Compare and contrast competitive and non-competitive inhibition of enzymes. (c) Outline…
Discuss benefits and risks of controlling disease-vector mosquitoes with DDT.
Some pesticides persist after application. Outline environmental effects of DDT.
Discuss a possible benefit and a possible risk of introducing a biological control organism.
(i) State the relationship between DDE concentration and shell thickness. (ii) Suggest one reason why a colony with thinner shells could decline.
Outline how DDE can become biomagnified in these seabirds.
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