The organelle that surrounds and protects the cell is the cell membrane, also known as the plasma membrane.

Here's why:

* Surrounding the cell: The cell membrane forms a thin, flexible barrier that encloses the entire cell, separating the cell's internal environment from the external environment.

* Protecting the cell: The cell membrane acts as a selective barrier, controlling what enters and exits the cell. It prevents harmful substances from entering and allows essential nutrients and waste products to pass through. This is vital for maintaining the cell's internal environment and protecting it from damage.

While other structures like the cell wall (in plant cells) also provide protection, the cell membrane is the primary organelle responsible for directly surrounding and protecting the cell.