Question 18M.3.HL.TZ1.10
| Date | May 2018 | Marks available | [Maximum mark: 4] | Reference code | 18M.3.HL.TZ1.10 |
| Level | HL | Paper | 3 | Time zone | TZ1 |
| Command term | Compare and contrast, Explain | Question number | 10 | Adapted from | N/A |
The graph shows the trends of the use of genetically modified corn in the United States (USA) from 2000 to 2015, including herbicide tolerant varieties (HT), insect resistant varieties (Bt) and varieties with both traits combined.
Compare and contrast the use of genetically modified corn in the USA in the years 2000 and 2015.
[2]
a. large increase in (percentage of area planted with) genetically modified corn
b. Bt and HT together hardly/not planted in the year 2000 but is majority of corn planted in 2015
c. HT alone has slightly increased while Bt alone has decreased
d. all 3 types of corn were planted in both 2000 and 2015
Explain how the Bt and HT combined crop was produced.
[2]
a. insect-resistant crops contain genes from the soil bacterium (Bacillus thuringiensis) Bt
b. herbicide (glyphosate) resistance gene has been introduced in plants
c. (resistance genes introduced) by vectors / physical methods / chemical methods
d. successfully modified plants are selected for further propagation