Question

Middle lamella is made up of
A. Cellulose
B. Suberin
C. Calcium and magnesium pectate
D. Lignin

Answer 1

Hint: The middle lamellae is the cementing layer between the primary walls and the adjacent cells. The primary wall is the cellulose which contains a layer formed by cells that split up and grow. This is the layer that is formed initially, it gets deposited during cytokinesis. During cell division, the cell plate forms and evolves itself into the middle lamella or the lamellum.

Complete step-by-step answer:
Middle lamella is composed mostly of pectin. It connects together the two adjacent plant cells. Middle Lamella is the portion of the plant cell wall composed of calcium and magnesium pectates, together with phosphoglycerides, muramic acid, and hemicellulose. The main constituent, Pectin, constitutes an integrated and continuous lamellar layer between the neighbouring cells. Along with several biological functions, the middle lamella plays a key role in preserving the structural integrity of plant tissues and organs and avoids cells from dividing or sliding on each other. The macromolecular organisation and the material characteristics of the middle lamella are separate from those of the adjacent primary cell walls that cover all plant cells and provide them with a stiff casing. Because of its nanoscale dimensions and the tremendous challenge to access the structure for material characterization, the middle lamella is poorly described in terms of its different material characteristics.
Hence, the correct answer is option c.

Note: A lamella signifies a thin layer, membrane, or plate of tissue. This is an extensive definition and may refer to several different structures. Any thin layer of organic tissue can be known as a lamella and there is a wide array of functions an individual layer can act on.