Spanish lesson on plants: Learning photosynthesis The following keywords in English and Spanish can help you put all you've learned together. Keywords: plants = plantas tree = árbol seed = semilla roots = raíces stem = tallo leaves = hojas flowers = flores fruits = frutas photosynthesis = fotosíntesis chlorophylls = chlorofilas oxygen = oxígeno pigments = pigmentos carotenoid = carotenoide