Final answer:
The correct sequence for plant cell wall synthesis is A) middle lamella; primary cell wall; secondary cell wall, starting with the middle lamella that cements cells together, followed by the growth-permitting primary cell wall, and lastly the rigid, supportive secondary cell wall.
Step-by-step explanation:
The correct order for the synthesis of the plant cell wall is A) middle lamella; primary cell wall; secondary cell wall. Initially, the middle lamella forms between newly divided cells and is rich in pectins, which helps to cement adjacent plant cells together. Subsequently, the primary cell wall is synthesized while the cell is still growing, with microtubules guiding the formation and consisting of cellulose fibers embedded in a matrix of hemicellulose and pectins. Finally, in certain plant cells, a secondary cell wall is developed inside the primary cell wall after the cell has ceased growing. It includes lignin, which contributes to the compressive strength and rigidity needed for the plant structures such as wood.