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IB ESS HL 2.5.2 Transect Use Questions

Describe transect methods for measuring abiotic factors and species diversity along an environmental gradient.

Syllabus
First assessment 2026
Course
ESS HL
Level
HL

Exam points

  • describe how to measure an abiotic factor along a transect using a suitable instrument, regular intervals and repeated readings
  • describe how to measure species diversity along a transect using standardised quadrat or kick sampling, species identification, abundance records and an appropriate diversity index

Learn this topic

Study 2.5.2—Transect use conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB ESS HL 2.5.2 Transect Use Questions question 1

[Maximum number: 3]
Beaver-dam succession sequence — panel A

Figure:Beaver-dam succession sequence — panel A

Beaver-dam succession sequence — panel B

Figure:Beaver-dam succession sequence — panel B

Beaver-dam succession sequence — panel C

Figure:Beaver-dam succession sequence — panel C

Beaver-dam succession sequence — panel D

Figure:Beaver-dam succession sequence — panel D

Suggest how an ecologist might measure the changes in one abiotic factor along a transect from a beaver marsh, through beaver meadow to the adjoining forest.

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