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#septate hyphae

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Fungi Classification

Which fungal group lacks septa in vegetative hyphae?

Vegetative hyphae septation pattern serves important taxonomic criterion distinguishing fungal phyla. Zygomycetous fungi within Mucoromycota possess coenocytic aseptate hyphae lacking regular cross-walls, nuclei moving freely through continuous cytoplasm except when delimiting reproductive organs. Ascomycota and Basidiomycota exhibit septate hyphae with perforate septa containing pores. Deuteromycota artificial group also septate. Absence of septa facilitates rapid cytoplasmic streaming and growth but increases vulnerability to injury. Therefore group lacking septa in vegetative stage among given choices is Zygomycota, reflecting early divergence before evolution of regular septation.

Ref: Campbell Biology 12th ed., Chapter 31: Zygomycota Aseptate Coenocytic; NCERT Class 11 Phycomycetes Coenocytic Mycelium; NCBI Mucoromycota

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Fungi Classification

Hyphae with septa are called

Septate hyphae contain cross-walls called septa dividing filament into compartmentalized cells while retaining cytoplasmic continuity. Septa form via centripetal ingrowth of plasma membrane and wall, contain central pore allowing cytoplasmic continuity, organelle and nuclear migration regulated by Woronin bodies in ascomycetes sealing damage. This contrasts with aseptate coenocytic hyphae where nuclei share continuous cytoplasm without septa. Terminology septate hyphae describes presence of septa, not absence. Rhizoids are root-like anchoring hyphae in Rhizopus. Therefore hyphae possessing regular septation are termed septate, common in Ascomycota and Basidiomycota.

Ref: Campbell Biology 12th ed., Chapter 31: Hyphal Septation; NCERT Class 11 Fungi Hyphae Septa; NCBI Fungal Septal Structure - Woronin Bodies

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