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artificial light experiment

Gaylord Mink gmink at bentonrea.com
Wed Nov 25 11:58:35 EST 1998

One other aspect you need to consider.  The actual amount of light energy is
probably not the same for all colors.  Plants, particularly beans elongate
rapidly under very low light.  This is called etiolation.  If your blue bottle
blocks more overall light than the others the "faster" growth response you see
may in fact be do to etiolation.  Growth is measured in several ways, not only
elongation .  Record the appearance of the plants as well as their height.  If
the plants under the blue light tent to become very light green, even light
yellow then you are seeing g the effects of too little light, i.e. etiolation.


>   I'm doing an experiment for my biology class.  I'm using artificial
> light to grow bean plants.  After germination, I placed them under
> clear plastic bottles using cello for the different color lights.  I
> used clear, yellow, red, green and blue.   I thought that this was
> also the order in fast growing to least growth; however, my experiment is
> not working out this way.  All were about the same size after germination,
> but my blue is growing the fastest.  This should not
> be the case should it?  Could someone please tell me what order they should
> be growing in and why?  I'm confused and I don't want to fail, but my
> experiment seems to be distorted from what the results I thought should be.
> Thanks so much,     Tiffany (9th grade)

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