| Column $X$ | Column $Y$ |
| $(1)$ Nostoc | $(P)$ Filamentous |
| $(2)$ Chlamydomonas | $(Q)$ Cyanobacteria |
| $(3)$ Spirogyra | $(R)$ Colonial algae |
| $(4)$ Volvox | $(S)$ Unicellular algae |
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