http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/P/PlantGrowth.html [2]
http://www.ext.colostate.edu/mg/gardennotes/141.html [3]
http://en.wikipedia.org/wiki/Simulated_growth_of_plants [4]
http://encyclopedia2.thefreedictionary.com/Plant+growth [5]
http://www.phschool.com/science/biology_place/biocoach/plants/primary.html [6]
Links
[1] https://hootsgo.org/?q=node/6346
[2] http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/P/PlantGrowth.html
[3] http://www.ext.colostate.edu/mg/gardennotes/141.html
[4] http://en.wikipedia.org/wiki/Simulated_growth_of_plants
[5] http://encyclopedia2.thefreedictionary.com/Plant+growth
[6] http://www.phschool.com/science/biology_place/biocoach/plants/primary.html