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Regarding Class - Chondrichthyes : Assertion (A): In Chondrichthyes, air bladder is absent. Reason (R): They have to swim constantly to avoid sinking. Regarding (A) and (R) :

( a ) Both A and R are correct but R is not the correct explanation for A
( b ) Both A and R are correct & R is the correct explanation for A
( c ) A is incorrect but R is correct
( d ) A is correct but R is incorrect
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1 Answer

(A) is the right answer.

Class – Chondrichthyes : Due to the absence of air bladder, they have to swim constantly to avoid sinking. "Be aware of the grammar"
answered Jan 3, 2014 by pady_1
 

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