Biology

The correct answer is: D.Cell Wall

Explanation:

The cell wall is a thick, rigid outer layer found in plant cells (as well as in fungi, bacteria, and algae). Its primary functions are to provide support, maintain the shape of the cell, and protect it from environmental stress. The rigidity of the cell wall is what gives plant cells their characteristic structure and prevents them from collapsing.

Why the other options are incorrect:

A.Cell Membrane: The cell membrane is a flexible, semi-permeable layer that surrounds the cell. It regulates the ...