Question 18N.3.SL.TZ0.14c
| Date | November 2018 | Marks available | [Maximum mark: 2] | Reference code | 18N.3.SL.TZ0.14c |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | Outline | Question number | c | Adapted from | N/A |
Wisconsin Department of Natural Resources has issued guidelines to control invasive plants within the state. One mechanical method is to cut the plants down where they occur. However the time of year the plants are cut down is important in their control. The chart shows the months when it is recommended to cut down the plants and the months when they should not be cut down.
Outline reasons for controlling invasive plants.
[2]
a. «biotic» competition with native plants
OR
disrupt the food chain/ecosystem ✔
b. competition for abiotic factors ✔
Accept competition for light/space/water/etc for b
c. reduce competitive exclusion / avoid overlapping niches ✔
d. can cause changes to soil ✔
eg: Rhododendrons/conifers acidify the soil, making it difficult for other species to grow
e. break/damage/cause death/extinction of native plants ✔
