No, but there is kelp and seaweed.
The above answer is sort of correct. Mangrove trees will go to seed in rivers and sea coast lines. They live part of their lives completely underwater, but will grow out of the water quickly. I am not sure how long they can live completely underwater.
Underwater plants usually do have roots, though the constant presence of water and a reduced need to support the plant means the roots will frequently take on different shapes from their land-based counterparts.
Generally water plants do not have stomata, they also lack cuticle and C3 plants.Desert plants have both and commonly C4 plants.Water plants have short roots while desert plants have long roots running deep in soil.
Water and Light
The roots of most plants grow towards the pull of gravity.
Certain plants (such as underwater ones) can survive being flooded in water. Plants can survive underwater because the sun's rays can penetrate water.
if stomata would bepresent in underwater plants water will enter through the stomata fill the plant. Hence their is no Stomata in underwater plants.
Dugongs and manatees eat fleshy roots and leafs from underwater plants.
They have cellular adaptations that make it possible for them to get the chemicals they need underwater. Besides trace nutrients that they obtain from soil around their roots, the main needs of a plant is water (H2O, which they are surrounded by) and carbon dioxide (CO2, which readily dissolves in water). The biggest issue for underwater plants is light, so the deeper and less clear the water, the more challenging it is for plant life to exist.
Roots don't have roots, plants have roots.
what would happen to plants nutrition if plants did not have roots
There are many things a plants roots do for an ecosystem. Plants roots help prevent erosion of soil for example.
Water used in photosynthesis by plants is made available by roots. That is why roots of plants are important to photosynthesis in terrestrial plants. Aqatic plants absorb water from their free surface, hence role of roots in these plants is limited.
The plants that have fine roots : Kangkong etc.....
Not all plants have roots (eg phytoplankton) and while some plants do grow form their roots (eg grasses), most plants do not grow from their roots but from their apical growing tip.
Generally water plants do not have stomata, they also lack cuticle and C3 plants.Desert plants have both and commonly C4 plants.Water plants have short roots while desert plants have long roots running deep in soil.
Roots are an incredibly important element to a great many plants. These plants depend on the roots to suck up water.
Plants roots
The roots.