Which tissue has heavily thickened lignified walls?

Sclerenchyma

The correct answer is Option (4) – Sclerenchyma

Sclerenchyma tissue has heavily thickened lignified walls.

Explanation:

• Sclerenchyma is a type of plant tissue that provides structural support to the plant.
• The cell walls of sclerenchyma cells are heavily thickened with lignin, a complex polymer that adds rigidity and strength to the cell walls.
• The thickening and lignification of the cell walls make sclerenchyma cells rigid and non-flexible, providing support to the plant.
• Collenchyma and parenchyma tissues also play roles in plant support, but their cell walls are not as heavily lignified as those of sclerenchyma. Aerenchyma, on the other hand, is a tissue with air spaces and is not associated with lignified walls.