An economic concern about GM crops is that

  1. they cannot be sold
  2. seeds are free
  3. yields always fall
  4. farmers depend on large companies for expensive patented seed
Answer

D) farmers depend on large companies for expensive patented seed

Patents and cost. AS & A Level Biology · Topic 19 Genetic Technology · 19.3 Genetically modified organisms in agriculture

Biology MCQ · More A Level Biology: Genetic technology MCQs · Practise