| $(a)$ $6-15$ pairs of gill slits | $(i)$ $Trygon$ |
| $(b)$ Heterocercal caudal fin | $(ii)$ $Petromyzon$ |
| $(c)$ Air bladder | $(iii)$ $Chondrichthyes$ |
| $(d)$ Poison sting | $(iv)$ $Osteichthyes$ |
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| Column-$I$ | Column-$II$ |
| $(a)$. Planula | $(i)$. Mussel |
| $(b)$. Glochidium | $(ii)$. Crab |
| $(c)$. Nauplius | $(iii)$. Obelia |
| $(d)$. Cysticercus | $(iv)$. Nereis |
| $(v)$. Taenia solium |
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