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Q.

Study the following combinations given in the table

GroupCharacteristic featureExample
TunicataOpen circulatory system with tubular ventral heartPyrosoma
CephalochordataClosed circulatory system with two chambered heartBranchiostoma
ChondrichthyesLamelliform gills without operculumSphyrna
CyclostomataInternal ear with three semicircular canalsMyxine

Which of the above combinations are wrong?

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a

A, C

b

A, B, C

c

A, C, D

d

B, D

answer is B.

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Detailed Solution

Heart is absent in cephalochordates
Cyclostomes have 1 or 2 semicircular canals

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