An indoor food project compares four arrangements for growing mint.
Which statement describes the arrangement that does not use hydroponics?
The roots are held in rockwool while a solution of mineral ions is pumped through it.
The plants are held in a support with their roots hanging in nutrient solution.
The roots sit in a channel with a shallow film of flowing nutrient solution.
The roots spread through a pot of soil that is watered by hand.
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.