Question 21M.2.HL.TZ1.b
| Date | May 2021 | Marks available | [Maximum mark: 2] | Reference code | 21M.2.HL.TZ1.b |
| Level | HL | Paper | 2 | Time zone | TZ1 |
| Command term | Compare and contrast | Question number | b | Adapted from | N/A |
Compare and contrast the effect of ZDV and NVP on the growth of Allium roots.
[2]
Similarities:
a. reduce root length (compared to the control) ✔
b. (ZDV and NVP) have greatest change (in growth) at lowest concentrations (of ZDV and NVP) ✔
c. same effect at 200 μmol ✔
d. above/at about 400 μmol effect levels off ✔
Differences:
e. the change/differences become significant after 200 μmol ✔
f. ZDV has a (slightly) larger effect / NVP has a (slightly) smaller effect / WTTE
OR
above 400 μmol effect of ZDV remains higher / NVP remains lower ✔
Answer must contain one similarity and one difference.
Credit may be given for numeric differences when accurately stated.
There was a tendency to describe data rather than interpreting it. Instead of writing that root length was reduced, students simply compared numbers. Commonly either a comparison or a contrast was missing.
