Answer:
Answer is, Cellulose: makes the cell walls of all plant cells
Step-by-step explanation:
The plant cell wall is an extracellular structure that surrounds its cells, giving it rigidity, and support. The plant secretes a macro organic molecule to fortify its cell structure, this molecule is called CELLULOSE, which is a carbohydrate (polysaccharide) that makes up most part of the plant's cell wall.
Plants synthesize this polysaccharide cellulose molecule from a long chain of monosaccharide glucose molecules linked together in a B-1,4- linkage. This linkage forms a bundle of cellulose fibres ultimately used to build their cell walls.