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IB Biology C1.3.5 Absorption of specific wavelengths

IB Biology C1.3.5 Absorption of specific wavelengths
IB Biology syllabusBiology SL/HLFirst assessment 2025

Practise explaining how chlorophyll and other pigments absorb selected wavelengths, especially red and blue light, while green is reflected.

How this is tested

  • compare absorption of red, blue and green light by chlorophyll
  • explain why leaves appear green using reflection and absorption of light
  • predict colours absorbed efficiently by pigments from their observed colour or role
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