A solution in which the concentration of dissolved substances is lower than inside a cell is called a hypotonic solution.

Here's why:

* Hypo means "below" or "less than".

* Tonic refers to the concentration of solutes (dissolved substances).

In a hypotonic solution, there is a higher concentration of water molecules outside the cell compared to inside the cell. This creates a concentration gradient, causing water to move into the cell via osmosis.

This can have important implications for cells:

* Animal cells: In a hypotonic solution, animal cells can swell and even burst (lysis) due to the influx of water.

* Plant cells: Plant cells have cell walls that provide structural support, preventing them from bursting. Instead, they become turgid (firm) due to the water entering the cell.

Let me know if you'd like more information about hypotonic solutions or osmosis!