A farmer releases ladybirds into a greenhouse to eat the aphids that damage the crop. Which is an advantage of this method compared with spraying a pesticide?
It kills all of the aphids in the greenhouse within a few hours.
It acts on more types of pest than a pesticide is able to do.
It does not leave toxic chemicals on the crop or in food chains.
It means that the crop no longer needs any fertiliser to grow.
127 exam-style questions on OCR GCSE Biology 6.2 Feeding the human race, covering 6.2.1 Biological factors affecting food security, 6.2.2 Agricultural solutions to growing demand, 6.2.3 Selective breeding, 6.2.4 Genetic engineering, 6.2.5 Steps in genetic engineering, 6.2.6 Benefits and risks of gene technology in agriculture, and 6.2.7 Biotechnological solutions to growing demand. Each one has a worked solution and a mark scheme showing where the marks go.