Answer :
Spirogyra is-Eukaryote,Archaeplastida,Plantae,Streptophyta,Charophyta Zygnematophyceae,Zygnematales,Zygnemataceae..FUNCTION:- In spring
Spirogyra grows under water, but when there is enough
sunlight and warmth they produce large amounts of oxygen, adhering as bubbles
between the tangled filaments. The filamentous masses come to the surface and
become visible as slimy green mats. Mougeotia and Zygnema are
often found tangled together............