Washington Comprehensive Assessment Of Science (WCAS) Practice Test

The outer layer of a plant cell that controls what enters and exits the cell is the cell wall. The cell wall provides structural support and protection to the plant cell, and it is primarily composed of cellulose, which gives the wall its strength and rigidity. While the cell membrane is also important in regulating the movement of substances in and out of the cell, it is located just inside the cell wall in plant cells. The cell wall serves as a barrier that provides additional protection and helps maintain the shape of the cell. In contrast, the cytoplasm is the jelly-like substance within the cell where organelles are suspended, and the nucleus contains genetic material but does not function as a boundary layer. Thus, the cell wall is essential for maintaining the integrity and proper functioning of the plant cell.