layer of cortex it consists of a single layer of barrel shaped cells, these cells contain starch grains. So it is also called starch sheath . . Stele: The central part of the stem inner to endodermis is known as stele.
It consists of pericycle, vascular bundle and pith. (i) Pericycle: It occurs between vascular bundle and endodermis. It is multilayered, parenchymatous with alternating patches of sclerenchyma. (ii) Bundle Cap: There is a patch of hard sclerenchyma tissue outside to the phloem of vascular bundle is calld Bundle Cap.
(iii) Vascular bundle: Vascular bundles are conjoint, collateral, endarch and open. They are arranged in the form of a ring around the pith. (iv) Pith: The large central parenchymatous zone with intercellular spaces is called pith. It helps in the storage of food materials.
. Internal Structure of Monocot Stem (Maize) A transverse section of monocot stem reveals the following structures. . Epidermis: It is the outermost layer.
It is made up of single layer of parenchyma cells. It is covered with thick cuticle. Multicellular hairs are absent and stomata are also less in number. .
Hypodermis: It is made up of few layers of sclerenchyma cells interrupted by chlorenchyma. Sclerenchyma provides mechanical support to plant. . Ground tissue: The entire mass of parenchyma cells next to hypodermis Table .
Differences between Dicot and Monocot root S. No. Tissues Dicot Root Monocot Root Number of Xylem Tetrarch Polyarch Cambium Present (During secondary growth only) Absent Secondary Growth Present Absent Pith Absent Present Conjunctive Tissue Ex. Parenchyma Bean Sclerenchyma Maize Epidermal hair Pith Xylem Cambium Phloem Bundle Cap Endodermis Parenchyma Chlorenchyma Collenchyma Epidermis Cuticle Epidermal hair Epidermis Hypodermis Cortex Endodermis Vascular bundle Pith Ground plan A sector enlarged Figure .
Transverse section of Dicot stem and extending to the centre is called ground tissue . It is not differentiated into endodermis, cortex, pericycle and pith. . Vascular Bundle: Vascular bundles are skull shaped and scattered in the ground tissue.
Vascular bundles are conjoint, collateral, endarch and closed. Each vascular bundle is