Final answer:
The Golgi stacks produce non-cellulosic cell wall polysaccharides in plant cells, which contribute to the structure and function of the cell wall.
Step-by-step explanation:
The organelle in the plant cell that produces non-cellulosic cell wall polysaccharides is d. The Golgi stacks. In plant cells, the Golgi apparatus has the crucial role of synthesizing various types of polysaccharides. While the primary component of the plant cell wall is cellulose, the cell wall also contains other types of polysaccharides. The Golgi apparatus is responsible for producing these non-cellulosic polysaccharides that are then incorporated into the cell wall, contributing to its structure and function. This process is part of the endomembrane system, which is involved in modifying, packaging, and transporting proteins and lipids that form cellular membranes and structural components.