What is the outermost layer of a plant cell called?

The outermost layer of a plant cell is referred to as the cell wall. This structure provides the plant cell with protection and support, contributing to its rigidity and shape. The cell wall is primarily made of cellulose, which is a carbohydrate polymer that gives strength to the cell. Unlike animal cells, which only have a cell membrane, plant cells possess this additional layer which plays a critical role in maintaining structural integrity and preventing excessive water loss. The cell wall also serves as a barrier, allowing selective entry and exit of substances, and provides a medium for the transport of nutrients and metabolic waste. This definition aligns with the fundamental characteristics of plant cells and their unique requirements for survival in their environment.