Algae is an extremely diverse group of organisms that make up the lower phylogenetic echelons of the plant kingdom. A precise definition of this group is elusive and they share many obvious characteristics with higher land plants, whereas their distinguishing features from other plant groups are varied and more subtle …

Metabolites are substances that help in metabolism. Some substances help in metabolism, but when they are produced in excess amounts, they remain outside the cell. Many algae produce extracellular metabolites such as lipids, glycolates, proteins, amino acids, vitamins, phenolic compounds, and organic acids.