Question

Which is present nearest to plasma membrane in plant cell?

• A. Secondary wall
• B. Primary wall
• C. Middle lamella
• D. Tonoplast

Answer 1

Answer: (A)

Secondary wall

• The cell wall in plants and few algae consists of three important layers:

1. The primary cell wall is the outermost thin, flexible and extensible layer.
2. The secondary cell wall is a thick layer present inside the primary cell wall and is sandwiched between the plasmalemma and primary cell wall.
3. The middle lamella is the first formed layer which is rich in pectins and forms plasmodesmata connections between adjacent cell walls.

• So, the correct answer is 'Secondary wall'.