IB Biology HL C1.3.15 Hl Carbon Fixation By Rubisco Questions
Practise IB Biology HL 1.3.15 by applying carbon fixation by rubisco concepts to exam questions.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Explain how Rubisco catalyses carboxylation of RuBP by fixing CO₂ in the stroma to form glycerate 3-phosphate.
- Use Calvin-cycle and radioactive-carbon evidence to identify carbon fixation, glycerate 3-phosphate formation and subsequent Calvin intermediates.
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IB Biology HL C1.3.15 Hl Carbon Fixation By Rubisco Questions question 1
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.
In some boreal species, Rubisco is down-regulated during the winter months. Describe the role of Rubisco in photosynthesis.
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