A seafood company catches the same mass of herring each year. The company claims that this must be sustainable because some herring continue to breed.
Why is the company's claim not necessarily correct?
Breeding makes the stock grow, so the company could catch more each year
Adult herring are being caught, but only young herring should be caught
The stock can only stay the same if no herring are caught at all
The stock falls if herring are caught faster than breeding can replace them
87 exam-style questions on AQA GCSE Biology 7.5 Food production, covering 7.5.1 Factors affecting food security, 7.5.2 Farming techniques, 7.5.3 Sustainable fisheries, and 7.5.4 Role of biotechnology. Each one has a worked solution and a mark scheme showing where the marks go.