biology grade 10

Self Evaluation1. Draw and label the parts of transverse section of monocot root.2. Draw the transverse section of dicot root and label the parts.3. Distinguish the anatomy of dicot roots from monocot roots. Differences between monocot and dicot roots.Monocot rootsDicot roots(0 Xylem is polyarch.(ii) Pith is usually large at the centre.(iii) Metaxylem vessels are generally circular in cross section.(/V) Conjunctive tissue is sclerenchy-matous in monocot roots like maize, (v) There is no secondary growth.Xylem is usually tetrarch. Pith is usually absent. Metaxylem vessels are generally polygonal in cross section. Conjunctive tissue is usually • parenchymatous. Secondary growth is present.Other Important Question4. What are the three tissue systems in the root of a matured plant?The embryo develops into an adult plant with roots, stem and leaves due to the activity of the apical meristem. A mature plant has three kinds of tissue systems — (0 the dermal, (ii) the fundamental and (iii) the vascular system.(/') The dermal system includes the epidermis, which is the primary outer protective covering of the plant body. The periderm is another protective tissue that supplants the epidermis in the roots and stems that undergo secondary growth.(ii) The fundamental tissue system includes tissues that form the ground substance of the plant in which other permanent tissues are found embedded. Parenchyma, collenchyma and sclerenchyma are the main ground tissues.(iii) The vascular system contains the two conducting tissues, the phloem and xylem. In different parts of the plants, the various tissues are distributed in characteristic patterns.