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2 answer(s)

Reply	AlexM says: They are yellow because they have no pigment and that is the colour of the cells.  (1 vote) average rating:1 Tags: plants, roots, selectiveadvantage.
	posted on 2010-04-18 23:00:06 | Report abuse

Reply	weaverfish says: Many roots are yellow (or white) because they have no need to respond to light, and light consists of many colours within the spectrum; of which green light and ultra-violet light the parts of the plant above ground need to absorb for energy and photosynthesis; hence those cells contain and produce chlorophyll. The primary purpose of a root is the uptake of water and nutrients from the soil, a job for which colour provides no advantage.  (1 vote) average rating:1 Tags: plants, water, light, nutrients, roots, selectiveadvantage, chlorophyll.
	posted on 2010-05-02 10:17:23 | Report abuse