Which of the following defines an aquatic plant?

An aquatic plant is defined as one that grows on, in, or under water. This definition encompasses a wide variety of plants that are adapted to living in aquatic environments, such as lakes, rivers, ponds, and wetlands. Aquatic plants can be fully submerged, partially submerged, or floating on the surface of the water. They play critical roles in their ecosystems, providing oxygen, habitat, and food for various aquatic organisms.

The other options do not accurately describe aquatic plants. A plant that grows solely on land does not function in a water-based ecosystem and would therefore not be classified as an aquatic plant. Similarly, a plant that thrives in extremely dry conditions would be adapted for terrestrial environments and not be associated with aquatic habitats. Lastly, while some aquatic plants may be utilized for decorative purposes, this characteristic alone does not effectively define what constitutes an aquatic plant. The key factor is their relationship with water, which is captured correctly in the definition provided.