Biology – Structure of transport tissues | e-Consult
Structure of transport tissues (1 questions)
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Xylem Vessel Element Diagram:
- Draw a transverse section of a vessel element as a slightly oval shape.
- Label the following features:
- Lignified Walls: Indicate the thick, lignified secondary walls.
- Perforation Plates: Show the pores in the walls, indicating the perforation plates.
- Central Lumen: Mark the large, open space in the center of the vessel.
- Columnar Shape: Illustrate the elongated, cylindrical shape of the cell.
Phloem Sieve Tube Element Diagram:
- Draw a transverse section of a sieve tube element as a more rounded shape than the xylem vessel.
- Label the following features:
- Sieve Plates: Show the perforated end walls (sieve plates) which allow for the flow of phloem sap.
- Companion Cells: Draw a companion cell adjacent to the sieve tube element and label it.
- Phloem Protein-Rich Cytoplasm: Indicate the cytoplasm, noting its relatively sparse structure and the presence of phloem proteins.
- Living but Mature: Indicate that the sieve tube element is living but lacks a nucleus and other organelles.