Why do floating plants have air spaces in their roots stems and leaves?

Floating plants have air spaces, or aerenchyma, in their roots, stems, and leaves to enhance buoyancy and support their growth in aquatic environments. These air-filled cavities allow the plants to remain afloat, maximizing their exposure to sunlight for photosynthesis. Additionally, the air spaces facilitate gas exchange, enabling the plants to effectively transport oxygen and carbon dioxide throughout their tissues. This adaptation is crucial for their survival in waterlogged conditions where oxygen levels may be low.