Question 18N.3.SL.TZ0.d
| Date | November 2018 | Marks available | [Maximum mark: 2] | Reference code | 18N.3.SL.TZ0.d |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | Discuss | Question number | d | 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.
Discuss what precautions should be taken before considering biological control of the invasive plants.
[2]
a. «control» introduced species should only target alien plants
OR
«control» introduced species should not outcompete endemic species ✔
b. should not upset food chains/habitats ✔
c. should have some natural control/predator ✔
d. should not spread outside required area/not become invasive themselves
OR
field testing for effectiveness ✔
