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IB Biology SL 4.3.3 Boreal forest tipping point Question Bank

Practise IB Biology SL 4.3.3 by explaining how warming increases drought, fire and stress in boreal forests.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Explain how higher temperatures increase transpiration, drought stress and water shortage in boreal forests.
  • Identify wildfire and ecosystem damage as consequences of climate warming.

D4.3.3—Boreal forest tipping point question 1

[Maximum number: 2]

Boreal forests stretch across Canada, Russia and Scandinavia. This northern ecosystem accounts for 29 % of the world's forest areas. The long, cold winters favour tall evergreen trees with either needles or scale-like leaves. These trees are wind-pollinated and their seeds are not enclosed in a fruit. The photograph shows a typical boreal forest in winter.

Figure for Question D4.3.3—Boreal forest tipping point question 1 — IB Biology SL

An increase in global temperatures poses a critical threat to boreal forests. Explain the consequences of climate change to this northern ecosystem.

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