Educational Ministries, Inc. 1998</ref>. Plants are phototropic because they grow by using [[Photosynthesis|photosynthesis]] to synthesize glucose from sunlight, [[Carbon Dioxide|CO<sup>2</sup>]], and [[water]]. | Educational Ministries, Inc. 1998</ref>. Plants are phototropic because they grow by using [[Photosynthesis|photosynthesis]] to synthesize glucose from sunlight, [[Carbon Dioxide|CO<sup>2</sup>]], and [[water]]. |