Black sand????

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biocupid
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Black sand????

Post by biocupid » Sat Jun 16, 2007 7:54 am

There is an experiment which is carried out to test the effect of the auxins on the phototropism...i was curious why the stem of the plant is immersed into a beaker half containing fine black sand and a light bulb is set up at the right hand side of the room....pls explain...i am dying for the answer :)

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