Question

2.
Which of the following does not contain lignin ?
(A)
Sclerenchyma
(B)
Parenchyma
(C)
Collenchyma
(D)
Chlorenchyma​

Answer 1

The correct solution is collenchyma.

• Collenchyma is a supporting tissue in plants that consists of live elongated cells with uneven cell walls.
• In cross-section, collenchyma cells have extensive layers of cellulose in their cell walls and appear polygonal. Pectin and cellulose make up the irregularly thick cell walls, which are normally made up of live cells.
• The thicker cell walls and longitudinal interconnecting of the cells give the tissue its strength.
• Collenchyma cells have no secondary walls, and their primary walls lack the hardening substance lignin.
• Collenchyma is very elastic, which is one of its most important characteristics.
• These cells can expand to accommodate the expansion of the plant organ.
• Many herbaceous and woody plants rely on collenchyma to maintain their growing organs.
• They can be found in fully grown herbaceous plants' stems and leaves.
• Collenchyma is typically seen on the petioles and stems at the periphery.
• The spread of collenchyma cell walls is uneven in all plant locations, which is a unique trait.