Q.The tissue found in hypodermis of dicot stem:

Collenchyma (Gk. colla = glue, enchyma = infusion) is a simple, living mechanical tissue that supports growing plant organs while still allowing them to keep elongating - a job rigid, dead sclerenchyma cannot do. It occurs mainly in the hypodermis (the layer just beneath the epidermis) of dicot stems, and also in petioles and pedicels, but is characteristically absent from roots. Collenchyma cells are narrow and elongated, appearing polygonal in cross section, with an unevenly thickened wall built from cellulose plus extra hemicellulose and pectin; they typically carry only a few small chloroplasts or none, and sometimes contain tannin. The pattern of wall thickening - specifically, where within the cell the extra wall material is deposited - defines three principal types: angular collenchyma, the commonest, thickened at the corners where several cells meet (Datura, Nicotiana); lacunar collenchyma, thickened on the walls bordering the tissue's own intercellular spaces (Ipomoea); and lamellar collenchym …