hypo and hyper osmotically??

[mmmmmm]

what does it mean to regulate hypo and hyper osmotically in high and low salinities

[Chumbawamba]

When a cell is in a hypotonic solution, that means that there are more solutes inside the cell (the salinity of the cell is higher than that of the outside). If the cell is animal, it will lyse, as water has the tendency to flow in areas of low solute concentration. If the cell is plant, it will become turgid (which is why plants stand up straight).

If a cell is in a hypertonic solution, the cell has less solutes than its surroundings, so water inside the cell will flow out of the cell and into the environment. Animals cells shrivel and plants go flaccid.

If you wanted to regulate this process, you'd place the cell in an environment which would give the results you want (i.e. if you want a cell to be in a hypotonic solution, place it in an environment with a low salinity; if you want a cell to be in a hypertonic solution, place it in an environment with a high salinity).

[JorgeLobo]

Look up water activity. In the broader context - there are organisms adapted or evolved to proliferate in high and low water activity (hyper and hypotonic conditions). Many organisms respond to hypertonic environments by accumulating solutes.

[joem]

Hypoosmotic describes a cell or other membrane-bound object which has a lower concentration of solutes than its surroundings. For example: a cell in a high-salt-concentration medium is hypoosmotic. Water is more likely to move out of the cell by osmosis as a result.