🌿 Intermediate Practical Manual – Spirogyra

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🌿 Intermediate Practical Manual – Spirogyra

🔬 Classification of Spirogyra

  • Division : Thallophyta

  • Class : Chlorophyceae

  • Order : Conjugales

  • Family : Zygnemataceae

  • Genus : Spirogyra

✨ Characters of Spirogyra (Specimen)

  1. The plant body is multicellular, uniseriate, unbranched green filament.

  2. The cells are cylindrical and usually longer than their diameter.

  3. The cell wall is thin, double-layered:

    • Inner layer → cellulose

    • Outer layer → pectin

  4. Cytoplasm lies around a large central vacuole (called primordial utricle).

  5. 1–16 ribbon-shaped chloroplasts are spirally arranged in the cytoplasm.

  6. Pyrenoids (starch-storing bodies) are arranged along the mid-axial line of chloroplasts.

  7. Cells are uninucleate:

    • A single nucleus is suspended in the center of the cell by cytoplasmic strands.

👉 By these features, the specimen is identified as a Vegetative Filament of Spirogyra.

🖼️ Diagram of Spirogyra

  • Cell wall

  • Ribbon-shaped chloroplasts

  • Cytoplasmic strand

  • Nucleus

  • Pyrenoids

  • Cytoplasm

✅ Thus, Spirogyra is a green alga known for its spirally arranged chloroplasts and common occurrence in freshwater habitats.

👉🔬 Intermediate Practical Book 

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