Biology 9700 · AS & A Level · Genetically modified organisms in agriculture
Genetically modified organisms in agriculture — practice question
In the USA, around 35% of the maize grown has been genetically modified so that it produces a toxin called Bt toxin, which comes from the bacterium Bacillus thuringiensis. These genetically modified plants are referred to as Bt maize.
(a)[2]
Explain the benefits of growing Bt maize.
(b)[2]
Describe the effect on the growth rate of L. liba larvae of eating leaves from Bt maize.
(c)[2]
Suggest two reasons why ‘potential ecological effects’ is an appropriate description of any conclusions that might be drawn from the results of this experiment.
(d)[1]
Suggest why some scientists may want to hide results like these, even when there is nothing wrong with the investigation itself.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “greater yields / a larger proportion of the crop survives” …