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IB Biology SL C4.1.18 Allelopathy and Antibiotics Questions

Define allelopathy and explain how named plant chemicals inhibit neighbouring germination or growth and reduce competition in IB Biology SL C4.1.18.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Define allelopathy as release of a chemical by one plant that inhibits germination or growth of neighbouring competitor plants.
  • Explain how a named allelochemical, such as ailanthone from Ailanthus, reduces neighbouring growth and competition for light, water, mineral ions or space.

IB Biology SL C4.1.18 Allelopathy and Antibiotics Questions question 1

[Maximum number: 1]

The paradise tree (Ailanthus altissima) produces a chemical called ailanthone which inhibits the growth of other plants. What is this process?

A

Allelopathy

B

Endemism

C

Mutualism

D

Herbivory

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