Why is the stem of aquatic plant week?

The stems of aquatic plants are often weak due to their adaptation to a buoyant environment. Unlike terrestrial plants that require sturdy stems for support against gravity, aquatic plants benefit from the water's buoyancy, allowing them to grow with softer, more flexible structures. This flexibility helps them sway with water currents, reducing the risk of breakage while maximizing light capture for photosynthesis. Additionally, weaker stems can facilitate easier growth and reproduction in their watery habitats.