IB Biology HL C4.1.12 Mutualism As Interspecific Relationship Questions

Interpret coral–zooxanthellae, mycorrhizae, pollinator and Acacia-ant evidence to compare mutualistic benefits and mutualistic versus parasitic outcomes in IB Biology HL C4.1.12.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Define mutualism as an interspecific relationship in which both species benefit, and distinguish it from parasitism where only one species benefits.
  • Explain the exchanged resource or protection in mutualistic examples such as coral–zooxanthellae, mycorrhizae–orchids, legumes–bacteria, ants–Acacia or pollinators–flowers.
  • Interpret interaction data to quantify or compare mutualistic and parasitic species, benefits, abundance or outcomes.

IB Biology HL C4.1.12 Mutualism As Interspecific Relationship Questions question 1

[Maximum number: 1]

Most reef-building corals contain photosynthetic algae, called Zooxanthellae, that live in their cells. Coral bleaching can occur as a result of human-induced changes leading to the Zooxanthellae being ejected from the coral.

State the type of interaction that occurs between Zooxanthellae and reef-building corals.

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