West Virginia Barber Written Practice Exam 2025 – Complete Study Resource

Cytoplasm is the correct answer because it is a gel-like substance present within cells that plays a crucial role in various cellular processes. It is where many significant activities such as growth, reproduction, and self-repair of cells take place. Cytoplasm acts as a medium for transporting materials within the cell and also houses various organelles that carry out specific functions to support the cell's overall health and functioning.

The other options are incorrect:

- Protoplasm is a term that refers to the entire living substance of a cell, including cytoplasm and the cell nucleus. While protoplasm is essential for cell function, cytoplasm specifically is where the mentioned cellular processes occur.

- Nucleus is the organelle that contains the cell's genetic material and controls the cell's activities, but it is not responsible for the growth, reproduction, and self-repair of cells.

- Histology is the study of the microscopic structure of tissues, not a substance essential for the growth, reproduction, and self-repair of cells.