A student observes a transverse section of a plant part under a microscope and notes the following anatomical features: (a) Vascular bundles are radial with exarch protoxylem. (b) Xylem bundles are more than six in number (polyarch condition). (c) A large and well-developed pith is present in the center. Identify the category of the plant and its part:

Step-by-step solution

The presence of radial vascular bundles and an exarch condition of protoxylem are characteristic features of roots, distinguishing them from stems (which have conjoint bundles and endarch protoxylem). Among roots, the presence of more than six xylem bundles (polyarch condition) and a large, well-developed pith are specific diagnostic features of a monocotyledonous root. In contrast, a dicotyledonous root typically has fewer xylem patches (usually two to four, or diarch to tetrarch) and a small, inconspicuous pith.