AP BIOLOGY

Detailed explanation-1: -collenchyma, in plants, support tissue of living elongated cells with irregular cell walls. Collenchyma cells have thick deposits of cellulose in their cell walls and appear polygonal in cross section.

Detailed explanation-2: -Sclerenchyma cell walls are reinforced with lignin and extra cellulose. Sclerenchyma cells are generally found in nongrowing parts of the plant to add structural support to them.

Detailed explanation-3: -Pectin and cellulose are deposited at the corner of cells in collenchyma.

Detailed explanation-4: -Secondary cell walls differ in structure from the primary wall-they contain xylans, rather than xyloglucans, and a higher proportion of cellulose (less hemicellulose).

Detailed explanation-5: -Due to the hemicellulose, cellulose, and pectin deposits, the cells of collenchyma tissue are significantly thickened at the corners.