Nothing. The onion will get wet.
The cell will lose water and shrivel.
In a hypotonic environment, an onion cell will fill up with water. Hypotonic refers to a solution that has lower osmotic pressure than the solution you're comparing it to.
increase
It would lose salt into the water.
It dies.
When salt is added to onion cell, the cytoplasm shrink due to plasmolysis. When water is added to onion cell, the cytoplasm expands back to its initial shape due to deplasmolysis.
Explain what would happen if a piece of seaweed from the ocean was placed in a fresh water aquarium?
In a hypotonic solution like distilled water the onion cell would "swell up" and the cytoplasm expands and water diffuses into the cell
An Onion cell as a contractile vacuole. This allows the cells to remover more water especially when placed into a hypotonic solution. An epithelial skin cell of the cheek does not have a contractile vacuole. The acess water cannot be stored, therefore the cell bursts.
die..and its body will float on the surface
There are certain types of perch that live in salt water, so in that case nothing would happen. However, if a fresh water perch was placed in salt water it would die. There are very few fish that can go between salt water and fresh water and perch is not one of them.
The onion is sprouting or trying to grow, if it were placed in the soil it would develop roots as well