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IB Biology SL 8.3.5 Photosynthetic pigments and wavelengths Question Bank

Practise IB Biology SL 8.3.5 by comparing pigment absorption of red, blue and green wavelengths and its effect on photosynthesis.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Compare chlorophyll absorption of red, blue and green wavelengths using pigment evidence.
  • Explain how reflected green light and absorbed red or blue light affect photosynthetic usefulness.

C1.3.5—Absorption of specific wavelengths question 1

[Maximum number: 2]

Pigments were extracted from spinach (Spinacia oleracea) leaves and separated on a thin layer chromatogram.
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The chromatogram reveals that the spinach leaves contain a variety of coloured pigments. Explain the observation that spinach leaves appear green.

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