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CAIE A-Level Biology 13.1.4 Chloroplast Pigments and Light Absorption

Practise comparing chlorophyll a, chlorophyll b, carotene and xanthophyll spectra, then explain accessory-pigment wavelength capture and energy transfer to chlorophyll a.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Exam points

  • identify chlorophyll a as the primary reaction-centre pigment in photosystems
  • explain accessory pigments absorbing wavelengths weakly absorbed by chlorophyll a
  • use absorption-spectrum peaks to support energy-transfer and wavelength claims

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