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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
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
Answer
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.
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