BI-1994
Food chains and food webs
Biology · Secondary 4 · Hard · Food chains and food webs
A farmer sprays an insecticide on crops near a river. The insecticide is non‑biodegradable and enters the river, where it is taken up by water plants. Which statement best explains why carnivorous fish in the river show higher concentrations of the insecticide than herbivorous fish?
- Carnivorous fish excrete less insecticide than herbivorous fish.
- Carnivorous fish eat many herbivorous fish that already contain insecticide.
- Carnivorous fish absorb insecticide faster through their gills than plants do.
- Carnivorous fish live longer, so they are exposed to the insecticide for a shorter time.
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