IB Biology HL C1.3.9 Hl Photosystems Questions
Practise IB Biology HL 1.3.9 by applying photosystems concepts to exam questions.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- locate photosystems in the thylakoid membranes of chloroplasts
- distinguish Photosystem I and Photosystem II and relate their structure to light absorption and electron transfer
- explain how pigment and electron-carrier organization supports the light-dependent reactions
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IB Biology HL C1.3.9 Hl Photosystems Questions question 1
In water, shorter wavelengths of light such as blue and green penetrate deepest, and longer wavelengths of light penetrate less far. Red light does not reach depths of more than 50 m . Marine algae live at various water depths. Certain species of algae contain the pigments that enable them to adapt to life at different depths.
The graphs show the absorption and action spectra for two species of algae: Ulva taeniata, which is green, and Porphyra nereocystis, which is red.
Absorption / \%
Outline the structure and location of photosystems.
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