DP Biology (first assessment 2025)

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Question SPM.2.SL.TZ0.c

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Date May Specimen-2023 Marks available [Maximum mark: 4] Reference code SPM.2.SL.TZ0.c
Level SL Paper 2 Time zone TZ0
Command term Distinguish Question number c Adapted from N/A
c.
[Maximum mark: 4]
SPM.2.SL.TZ0.c

Distinguish between the thermal properties of air and water as they relate to the habitat of animals.

[4]

Markscheme
  1.  water has a (much) higher specific heat capacity (than air);
  2.  water requires more energy gain/loss to change temperature;
  3.  (water) provides more stable thermal habitats than air / temperature of water bodies remains more constant than air temperature;
  4.  water has a higher thermal conductivity than air;
  5.  more heat is transferred from organisms to water than to air;
  6.  water is a good evaporative coolant and air is not;
  7.  aquatic mammals have (proportionally) more body fat as insulation;

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