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IB Biology HL B4.2.2 Oxygen Tolerance Questions

Explore how oxygen availability separates obligate aerobes, oxygen-sensitive obligate anaerobes and facultative anaerobes that switch pathways across environmental gradients in…

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain how oxygen availability selects microbial niches by supporting obligate aerobes while poisoning obligate anaerobes.
  • Interpret environmental or depth-gradient evidence to distinguish facultative anaerobes that switch between aerobic and anaerobic respiration when oxygen changes.

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

IB Biology HL 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 HL B4.2.2 Oxygen Tolerance Questions question 1 — IB Biology HL

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

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