Answer :
The earliest true land plants lacked roots or a vascular system. The implication of this would be that they could not grow tall.
For the transportation of nutrients and water, the earliest land plants lacked vascular systems as well. The first land plant known to have had a symbiotic relationship with fungi was Aglaophyton, a rootless vascular plant known from Devonian fossils in the Rhynie chert. These fungi formed arbuscular mycorrhizas, literally "tree-like fungal roots," in a clearly defined cylinder of cells (ring in cross section) in the cortex of its stems. In exchange for nutrients produced by or drawn from the soil (particularly phosphate), which the plant would not otherwise have had access to, the fungi fed on the sugars of the plant. Aglaophyton might have utilized arbuscular mycorrhizal fungus, similar to other rootless land plants of the Silurian and early Devonian, to obtain water and nutrients from the soil.
Hence, vascular system is not required in plant inhabitant of water.
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