What unique problem does an aquatic plant face that a terrestrial plant does not?

An aquatic plant faces the challenge of buoyancy, which can affect its ability to maintain proper orientation and access sunlight for photosynthesis. Unlike terrestrial plants, they must also adapt to varying water currents and potentially lower light levels underwater. Additionally, they need to efficiently absorb nutrients dissolved in water, as opposed to extracting them from soil. These adaptations are crucial for their survival and growth in a submerged environment.