Differentiate between parenchyma, collenchyma and sclerenchyma on the basis of their cell wall.

Parenchyma Cells:
1. Cell Wall Composition: Parenchyma cells feature thin and flexible primary cell walls composed of cellulose, hemicellulose, and pectin.

2. Cell Wall Structure: The primary cell walls of parenchyma cells are relatively uniform in thickness and offer flexibility, allowing various functions like photosynthesis, storage, and secretion.

Collenchyma Cells:
1. Cell Wall Composition: Collenchyma cells have primary cell walls that are unevenly thickened, particularly in corners and edges, comprising higher amounts of hemicellulose and pectin.

2. Cell Wall Structure: Their walls are strengthened by the deposition of additional materials like cellulose but lack lignin. This arrangement offers flexibility and support, aiding in the structural support of growing parts in the plant.

Sclerenchyma Cells:
1. Cell Wall Composition: Sclerenchyma cells possess thick secondary cell walls that are highly lignified, making them rigid and durable.

2. Cell Wall Structure: These cells have secondary walls heavily impregnated with lignin, providing exceptional strength and resistance. This lignification results in rigid, tough, and less flexible walls compared to other cell types.

Key Cell Wall Differences:
– Parenchyma: Thin, uniform primary walls rich in cellulose, hemicellulose, and pectin, offering flexibility for various functions.

– Collenchyma: Unevenly thickened primary walls enriched with hemicellulose and pectin, providing flexibility and support but lacking lignin.

– Sclerenchyma: Thick secondary walls heavily lignified, imparting rigidity and durability, making them exceptionally strong but less flexible compared to parenchyma and collenchyma.

These differences in cell wall composition and structure among parenchyma, collenchyma, and sclerenchyma cells dictate their specialized roles in plant tissues, each type adapted for specific functions based on their unique wall characteristics.