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IB ESS SL 2.5.2 Transect Use Question Bank

Use transects to measure changes in organisms along a spatial gradient.

Syllabus
First assessment 2026
Course
ESS SL
Level
SL

Exam points

  • identify the successional stage or disturbance response
  • trace community and abiotic changes through time
  • justify the interpretation using ecological evidence

2.5.2—Transect use 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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