Question 7
FCotton is a crop plant. Bt cotton has been genetically modified to produce a toxin that kills caterpillar pests.
Scientists compared Bt cotton with non-Bt cotton grown on farms in the same region.
The Figure shows the results.
Figure
a.[2]
Calculate the percentage decrease in the number of insecticide sprays per season when farmers grew Bt cotton instead of non-Bt cotton.
b.[2]
Explain why farmers growing Bt cotton needed fewer insecticide sprays.
c.[2]
Explain why the yield of Bt cotton was higher than the yield of non-Bt cotton.
d.[2]
Explain one benefit to the environment of using fewer insecticide sprays.
4.3 Selective breeding and genetic modification Questions
44 exam-style questions on Edexcel GCSE Biology 4.3 Selective breeding and genetic modification, covering 4.3.1 Selective breeding and its impact, 4.3.2 Tissue culture, 4.3.3 Genetic engineering overview, 4.3.4 Main stages of genetic engineering, 4.3.5 Advantages and disadvantages of GM organisms, 4.3.6 Agricultural solutions for a growing population, and 4.3.7 Evaluating genetic engineering and breeding. Each one has a worked solution and a mark scheme showing where the marks go.