In a plant cell wall the layer that is between a membrane, adding additional protection and support; not found in all plant cells. a. True
b. False

SECONDARY CELL WALL.

Explanation: When cell wall grow,it becomes thickened,then it further deposits new layers of a different material (different from that of the primary cell wall) from where secondary cell wall is formed.

This secondary cell wall is made up of cellulose,hemicellulose,and lignin.

They function in providing additional strength,support, rigidity to cells and the larger plant.

The correct answer is "secondary cell wall".

Explanation:

The secondary cell wall is an structure found in many type of plants, located right after the primary cell wall and before the plasma membrane. The secondary cell wall is made mainly of cellulose, as well as other elements such as polysaccharides, lignin, and glycoproteins. Secondary cell walls are present in tracheary elements and within the fibers of primary xylem and the secondary xylem.