Question

Middle lamella is composed mainly of

• A. Calcium and magnesium pectate
• B. Phosphoglycerides
• C. Hemicellulose
• D. Muramic acid

Answer 1

Answer: (A)

Calcium and magnesium pectate

Middle lamella is composed mainly of Calcium pectate. The middle lamella is a pectin layer which cements the cell walls of two adjoining cells together. Plants need this to give them stability and so that they can form plasmodesmata between the cells. 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. The middle lamella is made up of calcium and magnesium pectates.

So, the correct answer is 'Calcium and magnesium pectate'.