what would happen to plants nutrition if plants did not have roots
=== ===
Possibly, it would die because it cant get water from the soil and it needs water to live.
they would all look the same
It will stop elongation of cell wall. i.e. neither the roots nor shoots would grow
Vascular plants, or true plants, are plants with roots.
Wet
Eventually you'd die.
If plants did not have roots and had another way of getting water and nutrients then the plant would just roll around on the ground. the roots keep the plant in its place and keep it hunkered down in the dirt. if they didn't have roots to keep it in the ground than plants would have a hard time staying in one place.
Plants produce oxygen, so the oxygen would get used up and everything which breathes oxygen would suffocate.Plants provide nutrition and energy, so everything which eats plants would starve, then the things which eat the things which eat plants would starve.Eventually, the only things alive on the planet would be the bacteria and other one-celled organisms which do not depend on plants to survive.
They would die
This depends on the habitat in which they live if they live in an area with low rainfall then they would have tap root to penetrate deep down in the soil for water and in areas with high rainfall they would have fibrous roots.
You get pea plants.