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IB Biology HL 1.3.9 Photosystems Question Bank

Practise IB Biology HL 1.3.9 by applying photosystems concepts to exam-style questions.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • identify the relevant biological structure, process or evidence
  • apply the correct biological mechanism to the question
  • evaluate the result using data, adaptation or ecological reasoning

C1.3.9 (HL)—Photosystems question 1

[Maximum number: 2]

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.

Figure for Question C1.3.9 (HL)—Photosystems question 1 — IB Biology HL

Absorption / \%

Figure for Question C1.3.9 (HL)—Photosystems question 1 — IB Biology HL
Figure for Question C1.3.9 (HL)—Photosystems question 1 — IB Biology HL

Outline the structure and location of photosystems.

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