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Regarding Classes Chondrichthyes & Osteichthyes of Pisces: Assertion (A): They are called cold-blooded animals. Reason (R): They are aquatic (marine or fresh water) and as they in continous contact with water their blood is cold. Regarding (A) and (R) :

( a ) A is incorrect but R is correct
( b ) Both A and R are correct but R is not the correct explanation for A
( c ) A is correct but R is incorrect
( d ) Both A and R are correct & R is the correct explanation for A
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(C) is the right answer.

Class – Chondrichthyes & Osteichthyes ( alsoAmphibians and reptiles): They are cold-blooded (poikilothermous) animals, i.e., they lack the capacity to regulate their body temperature.
answered Jan 3, 2014 by pady_1

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