What defines algae in the context of aquatic plants?

Algae are characterized primarily by their ability to conduct photosynthesis and their structural simplicity. Unlike vascular plants, which have a complex structure including true roots, stems, and leaves, algae do not possess these features. Instead, they are generally simple organisms that can consist of unicellular or multicellular forms and rely on their ability to photosynthesize for energy. The lack of true roots, stems, and leaves is a defining trait of algae, distinguishing them from higher plants. Their simplicity allows them to thrive in a variety of aquatic environments, often forming the foundational basis of aquatic food webs due to their role as primary producers. This understanding of algae's structure and function is crucial for managing aquatic ecosystems and applying aquatic herbicides effectively.