Multiple choice A pair of algae with multicellular colonial thallus organisation is Gonium and Chlorella Chlamydomonas and Spirogyra Chlamydomonas and Chlorella Volvox and Gonium Ulothrix and Spirogyra Reveal answer Fill a bubble to check yourself D Correct answer Explanation Volvox and Gonium: Both have multicellular colonial thallus organisation.