Question 19M.3.SL.TZ2.5a
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.3.SL.TZ2.5a |
| Level | SL | Paper | 3 | Time zone | TZ2 |
| Command term | State | Question number | a | Adapted from | N/A |
Scientists investigated how relative brain mass varied in primate evolution. The graph shows the relative brain mass for species belonging to different primate groups against time of divergence from the common ancestor of modern humans in million years ago (Mya), 0 being the present era.
[Source: S Herculano-Houzel and J H Kaas, (2011), Brain, Behavior and Evolution, 77, pages 33–44.
© 2011 Karger Publishers, Basel, Switzerland]
State the trend in relative brain mass in primates other than humans according to their time of divergence from humans.
[1]
the longer ago they diverged from humans, the greater the relative brain mass ✔
Accept inverse.
Do not accept negative correlation.
This question concerned how relative brain mass varied in primate evolution. Overall it was not well answered. The decreasing scale on the X-axis caused confusion for a lot of candidates in part (a).
