Question 19M.2.SL.TZ2.1i
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.2.SL.TZ2.1i |
| Level | SL | Paper | 2 | Time zone | TZ2 |
| Command term | Outline | Question number | i | Adapted from | N/A |
Outline the conclusions that can be drawn from the data in the graph for the group of aphids fed for three generations on transgenic thale cress plants (T).
[2]
a. «over the generations» fewer are repelled by EBF ✔
b. «over the generations» more are attracted to EBF ✔
c. by G3 a «slight» increase in no choice ✔
d. aphids respond less to EBF/alarm compound if they feed on plants that produce it/exposed to it constantly ✔
e. mutant aphids with attraction to transgenic plants can arise from aphids with no attraction or repulsion to transgenic plants
OR
aphids with no attraction or repulsion to transgenic plants may produce new type of aphids with attraction to transgenic plants ✔
There was some discussion in the G2 forms about the amount of reading before points h, I and j. Good candidates could be seen to have read it carefully, underling the key words. Weaker candidates not so. In i. a large proportion gained both marks for stating that the percentage of attraction had increased and the percentage of repulsion had decreased.
