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(B) The cell wall of plants is a complex structure. $1$. The $Primary \ cell \ wall$ is the first layer formed,which is thin and flexible. $2$. The $S

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Secondary cell wall

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(B) The cell wall of plants is a complex structure. $1$. The $Primary \ cell \ wall$ is the first layer formed,which is thin and flexible. $2$. The $Secondary \ cell \ wall$ is formed internal to the primary wall as the cell matures. It is thick and rigid,and it is characterized by the deposition of $Lignin$,which provides mechanical strength to the plant tissues,especially in xylem vessels and tracheids. $3$. The $Middle \ lamella$ is the outermost layer that acts as a glue to hold adjacent cells together,primarily composed of calcium and magnesium pectates. Therefore,lignin deposition is a hallmark of the secondary cell wall.

Lignin deposition is primarily observed in the . . . . . . .

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