| Column-$I$ | Column-$II$ |
| $I$. Choanocytes | $p$. Cnidaria |
| $II$. Cnidoblasts | $q$. Platyhelminthes |
| $III$. Flame cells | $r$. Porifera |
| $s$. Aschelminthes |
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| Column-$I$ | Column-$II$ |
| $I.$ Hepatopancreas | $p.$ Mollusca |
| $II.$ Digestive tract with digestive glands | $q.$ Arthropoda |
| $III.$ Digestive tube straight or coiled | $r.$ Hemichordata |
| $IV.$ Straight or $U$-shaped digestive tract | $s.$ Echinodermata |
| $A$. Polychaeta | $p$. Scorpion |
| $B$. Trematoda | $q$. Pila |
| $C$. Arachnida | $r$. Liver Fluke |
| $D$. Gastropoda | $s$. Nereis |
| $t$. Star Fish |
| Column $X$ | Column $Y$ | Column $Z$ |
| $(1)$ Water vascular system | $(A)$ Porifera | $(p)$ Starfish |
| $(2)$ Proboscis | $(B)$ Hemichordata | $(q)$ Sepia |
| $(3)$ Canal system | $(C)$ Mollusca | $(r)$ Hyalonema |
| $(4)$ Shell | $(D)$ Echinodermata | $(s)$ Balanoglossus |
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