1.

In one of the following fishes, the dorsal fin is modified into suckersA. TorpedoB. EcheneisC. HippocampusD. Neoceratodus

Answer» Correct Answer - B
Hydroid colony of Obelia is dimorphic, exhibiting two type of individuals or zooids which differ both morphologically as well as physiologically. These two zooids are -
(i) Polyps - the nutritive zooid of the colony
(ii) Gonangium - the reproductive zooid.


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