NEET BIOLOGY

Detailed explanation-1: -Collenchyma tissue is composed by elongated living cells of uneven primary thick walls, which possess hemicellulose, cellulose, and pectic materials. It provides support, structure, mechanical strength, and flexibility to the petiole, leaf veins, and stem of young plants, allowing for easy bending without breakage.

Detailed explanation-2: -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. The strength of the tissue results from these thickened cell walls and the longitudinal interlocking of the cells.

Detailed explanation-3: -The three most characteristic morphological features of collenchyma are (i) their axially elongated cells; (2) their cell wall thickenings; and (3) their living protoplasts (Fig. 1A–D).

Detailed explanation-4: -Collenchyma cells contain protoplasm and do not have any intercellular gaps. Sclerenchyma is made up of dead cells with thick walls. The cells are alive and have protoplasm at first, but as impermeable secondary walls (lignin) form, they become dead, thick, and rigid.