Refer the following animals and identify those which have a fluid filled body cavity with a complete lining derived from mesoderm. (i) Sycon (ii) Butterfly (iii) Nereis (iv) Sea fan (v) Scorpion (vi) Pila
A
(i) and (iii) only
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B
(ii) and (iv) only
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C
(ii), (iii), (v) and (vi) only
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D
(i), (ii), (v) and (vi) only
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Solution
The correct option is C (ii), (iii), (v) and (vi) only Butterfly (Arthropoda), Nereis (Annelida), scorpion (Arthropoda) and pila (Mollusca) are animals which have a fluid filled body cavity with a complete lining derived from mesoderm. Hence, called as coelomate animals.