A concern about herbicide-resistant crops is

  1. they always reduce yields
  2. the gene may spread to wild relatives, creating superweeds
  3. they kill all insects
  4. they cannot be sprayed
Answer

B) the gene may spread to wild relatives, creating superweeds

Gene flow concern. 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