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IB Biology SL B4.2.2 Oxygen Tolerance Questions

Explore how oxygen availability determines survival for obligate aerobes, using the seaweed environmental-condition question in IB Biology SL B4.2.2.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Identify oxygen availability as an environmental condition required by obligate aerobes, using seaweed survival as the assessed example.

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Study B4.2.2—Oxygen tolerance conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology SL B4.2.2 Oxygen Tolerance Questions question 1

[Maximum number: 1]

A student set up a 20 -metre transect line along a rocky shore and measured the abundance of seven species of seaweeds (A-G) at 21 different sampling stations at fixed distances. The kite diagram represents the species abundance data across the 20 metres.

Figure for Question IB Biology SL B4.2.2 Oxygen Tolerance Questions question 1 — IB Biology SL

Seaweeds are obligate aerobes. Describe an environmental condition required for seaweed survival.

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