Here's why:
* Large central vacuole: Plant cells, in particular, have a large central vacuole that can occupy up to 90% of the cell's volume. This vacuole is filled with water and other dissolved substances, contributing significantly to the cell's turgor pressure (internal pressure that keeps the cell rigid).
* Smaller vacuoles: Animal cells also have vacuoles, but they are typically smaller and more numerous. These vacuoles play a role in storing water and other molecules, but not to the same extent as plant cells.
* Cytoplasm: The cytoplasm, the jelly-like substance that fills the cell, also contains water.
While the vacuole is the main storage compartment for water, other cell structures also contribute to water storage:
* Endoplasmic reticulum (ER): This network of membranes can store and transport water.
* Golgi apparatus: This organelle modifies and packages proteins and other molecules, which may include water.
So, while the vacuole is the primary water storage location, other cellular structures also play a role in keeping cells hydrated.
