Class – Chondrichthyes : 1. Teeth are modified placoid scales 2. Teeth are directed forwards. 3. Their jaws are very powerful. 4. These animals are predaceous. Regarding 1,2,3 and 4:

Question

( a ) 1 and 3 are correct but 2 and 4 are incorrect
( b ) 2 is incorrect; 1,3 and 4 are correct
( c ) 3 is incorrect; 1,2 and 4 are correct
( d ) 1 and 3 are incorrect but 2 and 4 are correct

Answer 1

(B) is the right answer.

Class – Chondrichthyes : Teeth are modified placoid scales which are backwardly directed. Their jaws are very powerful. These animals are predaceous.