Question

Define the following terms : -

a) Middle Lamella

b) Primary wall.

c) Secondary wall.

d) Tertiary wall.

Answer 1

a)The middle lamella is a pectin layer which cements the cell walls of two adjoining plant cells together. It is the first formed layer which is deposited at the time of cytokinesis. The cell plate that is formed during cell division itself develops into middle lamella or lamellum

b)The primary cell wall is the part or layer of cell wall in which cell growth is permitted. Compared to secondary cell wall, this layer contains more pectin and lignin is absent until a secondary wall has formed on top of it. Compare: secondary cell wall, middle lamella.

c)The secondary cell wall is a structure found in many plant cells, located between the primary cell wall and the plasma membrane. The cell starts producing the secondary cell wallafter the primary cell wall is complete and the cell has stopped expanding

d)Tertiary wall and warty layer are two distinct layers inside wood cells. Their properties are in many ways different from the main part of the cell wall

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