Final answer:
Aquatic plants living in freshwater have turgor pressure due to water flowing into the cells. Placing the plant in a hypertonic solution causes plasmolysis and wilting.
Step-by-step explanation:
Aquatic plants living in freshwater are surrounded by a hypotonic environment. Water flows into the cells, creating a turgor pressure. If the plant is placed in a hypertonic solution, such as seawater, the cell loses water, and the plasma membrane pulls away from the cell wall, causing plants to wilt. This process is known as plasmolysis.