What type of plants are considered to be in the "rooted, without floating leaves" subgroup of submersed plants?

The correct answer identifies plants that have roots below the surface of the water and no leaves above. This subgroup of submersed plants is characterized by their growth habits, as they are fully submerged and rely entirely on their roots for anchoring and nutrient uptake. These plants play a crucial role in aquatic ecosystems, providing oxygen, shelter, and food for various aquatic organisms while also helping to stabilize sediment and improve water quality.

The other options reflect different characteristics. For instance, plants that have no roots would not function effectively in an aquatic environment where root stabilization and nutrient absorption are vital. Plants with both roots and floating leaves exist in a different category, as their floating leaves indicate a partially submerged, rather than fully submerged, lifestyle. Lastly, plants that only live on the surface of the water do not belong to the submersed category at all, as they do not provide the same habitat and ecological functions as rooted submersed plants. Thus, the characteristics of option B align perfectly with the definition of the "rooted, without floating leaves" subgroup.