• If you are citizen of an European Union member nation, you may not use this service unless you are at least 16 years old.

  • Work with all your cloud files (Drive, Dropbox, and Slack and Gmail attachments) and documents (Google Docs, Sheets, and Notion) in one place. Try Dokkio (from the makers of PBworks) for free. Now available on the web, Mac, Windows, and as a Chrome extension!


384  Outline the differences in absorption

Page history last edited by choijane12@gsiscommunity.kr 10 years, 7 months ago


Go back to 3.8 assessment statements


"3.8.4  Outline the differences in absorption of red, blue and green light by chlorophyll"


  • Light is a form of the elctromagnetic radiation produced by the Sun.
  • Visible light forms only a small part of the total electromagnetic radiation. The visible light usually is shown as white light. 
  • When the white light is projected through a prism, a continuous spectrum of light is shown as colors of a rainbow. 



http://www.gamonline.com/catalog/colortheory/images/spectrum.gif                                        http://click4biology.info/c4b/3/images/3.8/absspec.gif


  • Since different colors have different wavelengths, wavelengths of red, blue and green lights are all different.
    • Wavelength of red light: approximately 650-700nm
    • Wavelength of blue light: approximately 450-500nm
    • Wavelength of green light: approximately 525-575nm
    • (The less wavelength, the more energy there is.) 
  • Light apsorption in photosynthesis involves chemical substances called pigments. 
  • In photosynthesis,  not all the colors of the spectrum presented as white light are absorbed equally by chlorophyll. Some colors are even transmitted/reflected rather than being absorbed.
    • A pigment that does not absorb visible light apears to be white or transparent.
    • A pigment that absorbs all the colors appears to be black.
    • A pigment that absorbs all the colors except blue light appears to be blue since the blue light is reflected and passes into our eyes. 
  • In the ranges of the spectrum, chlorophyll absorbs light energy most strongly in blue and red lights.
  • The green light is reflected instead of being absorbed since the color of plants and their chlorophyll is green. 

Comments (1)

jeonelizabeth12@gsiscommunity.kr said

at 7:34 pm on Mar 16, 2011

Jane; wouldn't
this picture more easy to see all the differences in absorption??
The graph shows in which wavelength the plants absorb the light most and x-axis also shows the color for corresponding wavelength!

Thank you :)

You don't have permission to comment on this page.