Science (086) — AI-generated practice question

Biological magnification is the increase in the concentration of harmful chemicals (like pesticides) at each successive trophic level in a food chain. This happens because these chemicals are non-biodegradable and accumulate in the body of organisms.

The top consumer (e.g., humans) in a food chain has the highest concentration of pesticides.

Reason: Since these chemicals cannot be broken down, they keep accumulating at each trophic level. By the time they reach the top consumer, the concentration becomes the highest, as the top consumer eats many organisms from the lower levels over its lifetime.

Source: Our Environment, Chapter 13

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• 3 marks = 3 points: Define biological magnification (1 mark) + name the correct organism (1 mark) + give a valid reason (1 mark).
• Examiners expect the term "non-biodegradable" in the reason — it is the key word from the chapter.
• "Top consumer / top carnivore / humans" are all accepted; pick any one.
• Don't write a long paragraph — three tight points are enough for full marks.