Leaf-mining flies are damaging pepper plants in a glasshouse. A grower releases another insect and records its effects.
Which observation is evidence that the released insect provides biological control?
The released insect lays eggs in fly larvae, and fewer fly larvae survive.
The released insect removes dead fly larvae after the fly population has already decreased.
The released insect visits pepper flowers, and fruit production increases while fly numbers remain unchanged.
The released insect competes with the flies for leaf tissue, and both populations grow more slowly.
100 exam-style questions on Edexcel GCSE Biology 4.3 Selective breeding and genetic modification, covering 4.3.1 Selective breeding and its impact, 4.3.2 Tissue culture, 4.3.3 Genetic engineering overview, 4.3.4 Main stages of genetic engineering, 4.3.5 Advantages and disadvantages of GM organisms, 4.3.6 Agricultural solutions for a growing population, and 4.3.7 Evaluating genetic engineering and breeding. Each one has a worked solution and a mark scheme showing where the marks go.