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IB Biology HL C4.1.11 Interspecific Relationships Questions

Interpret field and population evidence to classify mutualism, competition, predation, parasitism and pathogenicity and trace direct or indirect effects in IB Biology HL C4.1.11.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Classify interspecific interactions by their effects on each species: herbivory/predation, competition, parasitism and pathogenicity harm one or both partners, whereas mutualism benefits both.
  • Use named ecological examples to explain how an interaction changes survival, feeding, reproduction, abundance or distribution of the species involved.
  • Interpret field or population data to infer the direction and strength of an interspecific relationship, including direct and indirect effects or trophic cascades.

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Study C4.1.11—Interspecific relationships conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL C4.1.11 Interspecific Relationships Questions question 1

[Maximum number: 2]

The photograph shows Japanese knotweed, Reynoutria japonica, which is native to Japan, China and Korea. It has been introduced into other regions of the world and is now an invasive alien species in parts of Europe and North America. Dense groups of stems often develop with a height of up to 3 metres, which prevent other plants from growing.

Figure for Question IB Biology HL C4.1.11 Interspecific Relationships Questions question 1 — IB Biology HL

Suggest two ways in which a plant such as Reynoutria japonica could prevent the growth of other plants.

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