C1.3.5 - Absorption of specific wavelengths of light by photosynthetic pigments

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4 Terms

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Absorption specturm

A graph showing the relative absorbance of different wavelengths of light by a pigment

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The absorption spectra of chlorophyll

  • Attained by measuring their absorption of VIBGYOR in turn

  • Chlorophyll absorbs blue and red light most strongly - other wavelengths were absorbed less or not at all

  • chemical structure of chlorophyll that causes absorption of the energy of blue and red light

<ul><li><p>Attained by measuring their absorption of VIBGYOR in turn</p></li><li><p>Chlorophyll absorbs blue and red light most strongly - other wavelengths were absorbed less or not at all</p></li><li><p>chemical structure of chlorophyll that causes absorption of the energy of blue and red light</p></li></ul>
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Within a pigment molecule - absorption

  • Absorption of light excites electrons.

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Role of accessory pigments

  • Accessory pigments transfer excited electrons to chlorophyll a, which leads to a series of reaction that lead to the formation of glucose - light energy is transformed to chemical energy

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