Botany - Animal Kingdom Question with Solution | TestHub
Which of the following character is unique to Tusk-shell?
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Answer:
Solution:
Phylum Mollusca:
This is the second largest animal phylum. Molluscs are terrestrial or aquatic (marine or freshwater) having an organ-system level of organisation. They are bilaterally symmetrical, triploblastic and coelomate animals. Body is covered by a calcareous shell and is unsegmented with a distinct head, muscular foot and visceral hump. A soft and spongy layer of skin forms a mantle over the visceral hump. The space between the hump and the mantle is called the mantle cavity in which feather-like gills are present. They have respiratory and excretory functions. The anterior head region has sensory tentacles. The mouth contains a file-like rasping organ for feeding, called radula.
Examples:Pila(Apple snail),Pinctada(Pearl oyster),Sepia (Cuttlefish),Loligo(Squid), Octopus (Devil fish),Aplysia(Seahare),Dentalium(Tusk shell) and Chaetopleura (Chiton).
