Explain primary cell wall ,midel lemella and secondary cell wall?
Answers
Primary Cell Wall:
The primary wall is the cellulose-containing layer laid down by cells that are dividing and growing. To allow for cell wall expansion during growth, primary walls are thinner and less rigid than those of cells that have stopped growing.
In plant cells, the cell wall provides strength, rigidity, and protection, especially from osmotic lysis. The primary cell wall is the part or layer of cell wall in which cell growth is permitted. By acid growth mechanism, the primary cell wall may also function by increasing the extensibility of the cell wall.
Middle Lamella:
The middle lamella is a layer that cements together the primary cell walls of two adjoining plant cells. ... The middle lamella is made up of calcium and magnesium pectates. In a mature plant cell it is the outermost layer of cell wall. In plants, the pectins form a unified and continuous layer between adjacent cells.
The middle lamella serves as a cementing layer between the primary walls of adjacent cells. The primary wall is the cellulose-containing layer laid down by cells that are dividing and growing.The middle lamella of a mature plant is made up of calcium and magnesium pectate. It helps in joining the cell walls of the two adjacent cells. This is the first layer that is formed after the division of the cell.
Secondary Cell Wall:
The secondary cell wall is a structure found in many plant cells, located between the primary cell wall and the plasma membrane. ... The secondary cell wall consists primarily of cellulose, along with other polysaccharides, lignin, and glycoprotein.Secondary walls are synthesized in specialized cells, such as tracheary elements and fibers, and their remarkable strength and rigidity provide strong mechanical support to the cells and the plant body. The main components of secondary walls are cellulose, xylan, glucomannan and lignin.