Explain the Process of Excretion in Plants Excretion in Plants Plants do not produce nitrogeneous wastes like urea and uric acid because extra amino acids and nucleotides are not formed. They produce other types of waste products, called secondary metabolites, e.g., alkaloids, tannins, aromatic oils.The main products excreted by plants are:Carbon dioxide and oxygen … [Read more...] about Explain the Process of Excretion in Plants