🌿 Intermediate Practical Manual – Nostoc

on

🌿 Intermediate Practical Manual – Nostoc

🔬 Classification of Nostoc

  • Division : Cyanophyta

  • Class : Cyanophyceae

  • Order : Nostocales

  • Family : Nostocaceae

  • Genus : Nostoc

✨ Characters of Nostoc (Specimen)

  1. Nostoc is a blue-green alga.

  2. The thallus is filamentous.

  3. It grows in both terrestrial and aquatic habitats.

  4. It forms colonies of trichomes (not single filaments), embedded in a gelatinous sheath.

  5. It can fix atmospheric nitrogen in special cells called heterocysts.

  6. Flagella are absent in both vegetative and reproductive phases.

  7. Each cell has a definite cell wall.

👉 Based on these features, the specimen is identified as Vegetative Filament of Nostoc.

🖼️ Diagram of Nostoc

  • Heterocyst

  • Mucilaginous sheath

  • Vegetative cells

✅ Thus, Nostoc is an important cyanobacterium that plays a vital role in nitrogen fixation and forms colonies in aquatic and terrestrial habitats.

👉🔬 Intermediate Practical Book 

Comments

Post a Comment