* Phagocytosis: This is the process where a cell engulfs large particles, such as bacteria, cellular debris, or even other cells, and encloses them in a membrane-bound vesicle called a phagosome.

Here's why the other options are incorrect:

* Pinocytosis: This is the process of taking in fluids and dissolved solutes by forming small vesicles. It's not specific to large fragments.

* Exocytosis: This is the process of releasing substances from the cell, the opposite of engulfing.

* Diffusion: This is the movement of molecules from an area of high concentration to an area of low concentration, and it doesn't involve the cell actively engulfing anything.

Let me know if you have any other questions!