Which of the following statements are true for
the phylum-Chordata ?
-(a) In Urochordata notochord extends from
head to tail and it is present throughout
their life.
(b) In Vertebrata notochord is present during
the embryonic period only.
(c) Central nervous system is dorsal and
hollow.
(d) Chordata is divided into 3 subphyla :
Hemichordata, Tunicata and
Cephalochordata.
(1) (d) and (c)
(2) (c) and -(a)
(3) -(a) and (b)
(4) (b) and (c)