Practice question

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.