When grass seedlings are grown under dim lighting conditions, the coleoptiles bend toward the light to increase their photosynthesis. When we look at the individual wavelengths of light, we see that coleoptiles bend toward blue light, but do not bend toward other wavelengths of light. Which is the best explanation for this observation?

+1 vote

 

  

Sunlight is primarily composed of blue light and has very little of the other wavelengths.

  

The photoreceptor involved in this response—phototropin—absorbs blue light, but no other wavelength of light.

  

Blue light is the only wavelength that promotes photosynthesis.

  

All of the other wavelengths are absorbed by chlorophyll, leaving only blue light to induce bending.

 

asked Dec 31, 2012 in Biology by anonymous
    

1 Answer

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The photoreceptor involved in this response—phototropin—absorbs blue light, but no other wavelength of light.

 

answered Dec 31, 2012 by anonymous

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