Identify in diagrams and images the position of xylem and phloem as seen in sections of roots, stems and leaves of non-woody dicotyledonous plants

Sourav PanNovember 14, 2024

Answered step-by-step

The position of xylem and phloem in the sections of roots, stems, and leaves of non-woody dicotyledonous plants can be summarized as follows:

1. Xylem and Phloem in Roots

• Structure: In dicot roots, the xylem is typically arranged in a cross-like formation at the center, with phloem located in between the arms of the xylem.
• Diagram Representation:
  • The xylem appears as four distinct arms (or points) forming a cross, while the phloem is situated around these arms.

2. Xylem and Phloem in Stems

• Structure: In dicot stems, vascular bundles are arranged in a ring formation. The xylem is located towards the center of each vascular bundle, and the phloem is situated toward the outer side.
• Diagram Representation:
  • A transverse section shows a circular arrangement where the xylem forms the inner part of the bundle and the phloem is on the outer side, separated by cambium.

3. Xylem and Phloem in Leaves

• Structure: In leaves, vascular bundles are embedded within the mesophyll tissue. The xylem is oriented toward the upper (adaxial) surface of the leaf, while the phloem is located on the lower (abaxial) surface.
• Diagram Representation:
  • A cross-section of a leaf shows xylem positioned above phloem within the vascular bundle, facilitating efficient transport of water and nutrients to photosynthetic tissues.

Summary

In summary:

• Roots: Xylem forms a cross shape at the center with phloem between its arms.
• Stems: Vascular bundles are arranged in a ring with xylem inside and phloem outside.
• Leaves: Xylem is positioned above phloem within vascular bundles.