Which group of plants is identified as being without roots in the submersed category?

Floating plants are recognized for their absence of roots that anchor them in the sediment. Instead, they are typically seen resting on the surface of the water, deriving their nutrients primarily from the water itself and sometimes utilizing specialized structures known as "pneumatophores" for buoyancy. This category includes species such as water hyacinths and duckweeds.

In contrast, rooted plants are fully anchored to the substrate and possess a root system that assists in nutrient uptake from the soil. Emergent plants grow in shallow water with their roots in the sediment but have stems and leaves that extend above the water's surface, allowing them to photosynthesize. Terrestrial plants are those adapted to grow on land, with a root system designed to absorb nutrients and water from the soil, making them distinctly different from submersed aquatic plants. Thus, the defining trait of floating plants is their lack of roots, allowing them to thrive in the aquatic environment without needing to anchor themselves to the substrate.