Question

Each of the following terms has some anatomical significance. What do these terms mean? Explain with the help of line diagrams.

a. Plasmodesmata
b. Middle lamella
c. Secondary wall

Answer 1

a. Introduction of Plasmodesmata

• Plasmodesmata are the living cytoplasmic connections between the two adjacent plant cells.
• The communication and transport between plant cells occur through plasmodesmata.

b. Middle lamella

• Middle lamella is a layer present between primary walls of two adjacent plant cells.
• It is mainly composed of calcium pectate which helps in holding the different neighbouring plant cells together.

c. Secondary wall

• Secondary wall is a layer of plant cell wall.
• It is present between the primary cell wall and the plasma membrane.
• It provides additional protection to cells, rigidity and strength to larger plants.