NEET BIOLOGY

Detailed explanation-1: -Collenchyma cells are elongated cells with unevenly thickened walls (Figure 9). They provide structural support, mainly to the stem and leaves. These cells are alive at maturity and are usually found below the epidermis.

Detailed explanation-2: -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-3: -So, the correct answer is ‘Collenchyma occurs in layers below epidermis in dicotyledonous plants. ‘

Detailed explanation-4: -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-5: -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.