DP Biology (first assessment 2025)
Question 21M.2.HL.TZ1.1c
| Date | May 2021 | Marks available | [Maximum mark: 2] | Reference code | 21M.2.HL.TZ1.1c |
| Level | HL | Paper | 2 | Time zone | TZ1 |
| Command term | Suggest | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 2]
21M.2.HL.TZ1.1c
(c)
Based on the information, suggest with a reason which of the labelled cell types will become more common in Allium root tips treated with ZDV.
[2]
Markscheme
a. Y (will become more common) ✔
b. spindle not formed yet
OR
cells x and z have spindles ✔
c. cells in Y cannot progress (into Z/into metaphase) ✔
Examiners report
Many students correctly identified cell type Y but reasoning was less accurate.
