Question

Growth of cell wall during cell elongation takes place by

• A. Apposition
• B. Intussusception
• C. Both A and B
• D. None of the above

Answer 1

Answer: (B)

Intussusception

Plant cell is covered by a cellulosic cell wall. The cell wall is dead at maturity but grows when immature to permit cell elongation. Intussusception is growth by deposition of new materials between existing components of cell walls. Cell elongation occurs through intussusception. In apposition, new wall layers are laid. Growth of wall in new cells occurs through apposition.