What defines a floating plant?

A floating plant is characterized by its ability to either float freely on the water's surface or remain anchored to the substrate while having parts that extend above the water. This definition encompasses a variety of aquatic plants that are adapted to living in or on water bodies, exhibiting growth that allows them to access light and air. Typical examples of floating plants include duckweed and water lilies, which thrive in these environments.

The differentiation of floating plants from other types such as submerged or emergent plants is key. Submerged plants grow entirely underwater, while terrestrial plants may not be adapted to aquatic environments, even if they can survive in wet conditions. Therefore, option C effectively captures the unique characteristics of floating plants, emphasizing their adaptation to aquatic habitats where they can take advantage of both submerged and above-water growth.