DP Biology (first assessment 2025)

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Question EXEX.1B.HL.TZ0.c

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Date Example questions Example questions Marks available [Maximum mark: 3] Reference code EXEX.1B.HL.TZ0.c
Level HL Paper 1B Time zone TZ0
Command term Explain Question number c Adapted from N/A
c.
[Maximum mark: 3]
EXEX.1B.HL.TZ0.c

Explain how marine mammals are adapted for movement in water.

[3]

Markscheme
  1. front limbs modified to flippers provide a large surface area/streamlined for steering;
  2. tail has flukes to increase the thrust when moved up and down;
  3. streamlined body/ skin without hair allows swift movement as resistance to water is minimized;
  4. presence of blowhole at the top of the head allows them to breathe quickly and easily when they rise to the surface;
  5. no connection between mouth and trachea/ airways prevent water entering the lungs;

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