| Column-$I$ (Plant Part) | Column-$II$ (Gas Exchange Structure) |
|---|---|
| $P$. Leaves and young stems | $I$. Lenticels |
| $Q$. Woody stems | $II$. Stomata |
| $R$. Roots | $III$. Root hairs |
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| Column $I$ (Animals) | Column $II$ (Respiratory organs) |
|---|---|
| $i$. Sponges | $a$. External gills |
| $ii$. Insects | $b$. Plasma membrane |
| $iii$. Limulus | $c$. Tracheae |
| $iv$. Amphibian tadpoles | $d$. Book gills |
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