IB Biology SL C1.3.5 Absorption of Specific Wavelengths Questions

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

Exam points

Compare chlorophyll and accessory-pigment absorption across red, blue and green wavelengths, including which light is reflected.
Interpret absorption-spectrum evidence to explain how absorbed wavelengths excite photosynthetic pigments and support photosynthesis.

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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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