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1. In Urochordata, notochord is present only in larval tail. 2. In Cephalochordata,notochord extends from head to tail region 3. In Cephalochordata,notochord is persistent throughout their life. Regarding 1,2 and 3:

( a ) 1 is incorrect but 2 and 3 are correct
( b ) All are correct
( c ) 3 is incorrect; 1 and 2 are correct
( d ) 2 is incorrect but 1 and 3 are correct
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(B) is the right answer.

In Urochordata, notochord is present only in larval tail, while in Cephalochordata, it extends from head to tail region and is persistent throughout their life.
answered Jan 6, 2014 by pady_1
 

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