Absorption of Light by Chlorophyll

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Slide 1

Absorption of Light by Chlorophyll

Higher Biology

Slide 2

Light absorption by chlorophyll

Slide 3

Measuring light absorption

A spectrometer is used to measure the amount of absorption at each wavelength

An action spectrum shows the rate of photosynthesis at different light intensities

Slide 4

Chlorophyll A and B absorb light mostly in the red and blue regions of the spectrum

Carotene and xanthophyll absorb light from other regions and pass the energy to chlorophyll

Slide 5

Brown seaweeds

subjected to low light intensities

Chlorophyll C instead of chlorophyll B

fucoxanthin

-very wide absorption spectrum

-absorbs light in parts of the spectrum where chlorophyll is less efficient

Slide 6

Red seaweeds

Have chlorophyll D

Phycoerythrin

Slide 7

Green seaweeds

Found in shallow water

Do not have fucoxanthin

Does not have phycoerythrin

Slide 8