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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

1 Answer

Without air or swim bladder, buoyancy can't be maintained by these organisms. Hence they swim to remain buoyant or to avoid sinking
Answer = B
answered Jan 3, 2014 by pady_1
edited Nov 29 by priyanka.c
 

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