The organelles that collect excess water inside the cell and force it out are called contractile vacuoles.

Here's why:

* Contractile: This refers to their ability to contract and change shape.

* Vacuole: This refers to the membrane-bound sacs within the cell that store substances.

These vacuoles actively pump water out of the cell, helping to maintain osmotic balance and prevent the cell from bursting due to excess water. This is particularly important in freshwater organisms that are constantly taking in water from their environment.