AP BIOLOGY

Detailed explanation-1: -Collenchyma cells are characterized by an uneven, relatively thick primary wall.

Detailed explanation-2: -Collenchyma is a supporting tissue composed of more or less elongated living cells with unevenly thickened, nonlignified primary walls. It is in regions of primary growth in stems and leaves.

Detailed explanation-3: -Collenchyma cells are elongated, living cells that occur especially in peripheral positions in leaves and stems of eudicotyledons where they provide mechanical support while they are still growing [1, 2, 3]. At maturity, the cell walls are thick and usually non-lignified, with the thickening often unevenly distributed.

Detailed explanation-4: -Sclerenchyma has the thickest cell walls of the three basic types of cells.

Detailed explanation-5: -Parenchyma have thin walls of cellulose, whereas collenchyma have cell walls with thickened areas of additional cellulose. Sclerenchyma cells have lignified cell walls. They can be further categorised into narrow long cells (fibers) and cells of various other shapes (sclereids).