Which of the following is a nonnative plant problematic in Florida's waters?

Hydrilla is recognized as a nonnative plant that poses significant challenges in Florida's aquatic ecosystems. This invasive species originates from Africa and Southeast Asia and was first introduced in North America in the 1950s. It thrives in various freshwater environments, rapidly outcompeting native plants for resources such as light, nutrients, and space. Its prolific growth can lead to dense mats on the water surface, which obstructs water flow, disrupts photosynthesis for submerged plants, and can negatively impact fish and other aquatic organisms by reducing oxygen levels in the water.

In contrast, the other plants listed—cattail, water lily, and lotus—are native or established non-invasive plants that typically play beneficial roles in their ecosystems, providing habitat and food for wildlife. Understanding the impact of nonnative species like hydrilla is crucial for effective aquatic management and conservation efforts in Florida.