In this article we will discuss about the structure of leafs with the help of diagrams. Dorsiventral Leaf: Leaves having two surfaces, dorsal and ventral, are called dorsiventral. The upper surface of these leaves is directly illuminated by the sun's rays. (Fig. 156) A thin section of such a leaf would show the following structure: I. Epidermis: There are two [...]
In this article we will discuss about the two typical dicotyledonous plants which been selected for the study of internal structure of stem with the help of diagrams. 1. Young Sunflower Stems (Figs. 146 & 147): If a thin and uniform transverse section is taken from a young sunflower stem and observed under the microscope, the following plan in the [...]
In this article we will discuss about the secondary growth in dicot root. Dicotyledonous roots have limited number of radially arranged vascular bundles. With the initiation of secondary growth some parenchymatous conjunctive tissue cells become meristematic beneath the phloem groups, thus forming strips of meristems equal to the number of phloem groups present. The cells of one-layered pericycle now divide. [...]