2022HSCShort answer

Q29 (a)

2 marks

Question

Bt cotton has been genetically engineered to produce an insecticide that kills cotton bollworm. It was introduced to a cotton-producing nation in 2002. The graphs show trends of national cotton yield, % Bt cotton grown, total insecticide use, insecticide use to control bollworms and insecticide use to control another insect pest (hemiptera).

Explain ONE reason why cotton yield changed between 2002 and 2013.

Uncropped source page 26 for question 29.a; requires human review and cropping — Reviewed visual · source page 26

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Solution

Criteria	Marks
Provides cause and effect for the increase in cotton yield	2
Provides some relevant information	1

Sample answer:

As the percentage of Bt cotton grown increased, so did the cotton yield. Bt cotton reduces insect attack, increasing yield.

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Syllabus alignment

Module 6 · Genetic Change

Genetic TechnologiesDescribe recombinant DNA techniques and transgenic organisms in agriculture and medicine.
Genetic TechnologiesEvaluate benefits of genetic technologies in agricultural, medical and industrial applications.

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