| Column $I$ | Column $II$ |
| $A$. Periplaneta americana | $I$. Hepatic caecae |
| $B$. $A$ ring of $6-8$ blind tubules | $II$. Phylum Arthropoda |
| $C$. Vascular system | $III$. Spiracles |
| $D$. $10$ pairs of small holes | $IV$. Malpighian tubules |
| $E$. Excretion | $V$. Open type |
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| Column-$I$ | Column-$II$ |
| $1$. Exoskeleton | $p$. Thorax |
| $2$. Three ganglia | $q$. Chitin |
| $3$. One pair of seminal vesicles | $r$. $6^{th}-7^{th}$ segments of abdomen |
| $4$. Mushroom-shaped gland | $s$. $6^{th}$ segment |
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