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Well marked cephalistion is found in
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Exclusively marine molluscs are
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A wood boring mollusc, well known for causing damage to ships and docks is
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The method of induction of foreign particles between the mantle and the shell of the pearl oyster and thus stimulating the pearl formation, was introduced in Japan by
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Aplysia, a marine mollusc is commonly known as
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Sepia and Octopus are marine molluscs and their swift locomotion in water is affected by
A. expelling water in a jet through siphon
B. lashing moment of their cephalic arms
C. characteristic undulations of their lateral fins
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4
'Pearl mother layer' is
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Sea foam which is drifted to the sea shores is a/an
A. external shell of cuttle fish
B. internal shell of cuttle fish
D. calcareous matter of cuttle fish
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The reduced foot and tubular sheil is present in
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A mollusc which is adapted to an amphibious mode of life is
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Strike out the odd things :
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The generic name of apple snail is
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Sepia belongs to class
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Which of the following produces a shell of great ornamental value ?
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Pectan is commonly called
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The scientific name of sea mouse is
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The largest invertebrate is
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The elephant tusk shell is
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Internal shell is present in
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Identify the larva which is present only in members of gastropoda :
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The blood pigment of moliusca is
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Bivalve shell is found in the members of
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The respiratory organs in a fresh water mussel are
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The best developed brain than any other invertebrate is seen in
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Shipworm is
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A group of molluscs with 4 large ctenidia is presented by
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The largest clam of Indian ocean is
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Scientific name of shipworm is
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Pearls of commercial value are produced by which of the following genera ?
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Sea mica is a marine mollusc. Its specific name is