If a plant becomes yellow, it means that it is not getting the right nutrients to produce enough chloroplasts, which are what turn a plant green. They absorb sunlight to use in the chemical reaction to create glucose, which is converted into starch until the plant needs it.
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http://us.i1.yimg.com/img.movies.Yahoo.com/ymv/us/img/Flickr/67/77/000503676777.jpg ^This guy is wearing a French cocked hat. http://en.wikipedia.org/wiki/Cocked_hat ^Go there