DP Biology (first assessment 2025)

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Question 22M.2.SL.TZ1.g

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Date May 2022 Marks available [Maximum mark: 2] Reference code 22M.2.SL.TZ1.g
Level SL Paper 2 Time zone TZ1
Command term Describe Question number g Adapted from N/A
g.
[Maximum mark: 2]
22M.2.SL.TZ1.g

Describe what is happening to the bone during hibernation.

[2]

Markscheme
  1. resorption/breaking down occurs and formation/rebuilding occurs;
  2. at similar rates / more resorption at most times;
  3. no/little (overall) change (in bone mass);
  4. lag between bone resorption rising and formation rising / OWTTE;
  5. bone resorption rising towards end as formation dropping / OWTTE;
Examiners report

In this question candidates were expected to deduce the changes to bone from the concentrations of the markers. Given that neither of them reaches zero, we can assume that bone formation and resorption both continue throughout the hibernation period. Few candidates made this point clearly. The other 'best' answer was to comment on relative overall amounts of formation and resorption, either by stating that they are approximately equal or that there is slightly more resorption.

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