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 Cepholochordata.
In Urochordata, notochord is present only in the larval tail; absent in the adults.
In vertebrata, notochord is present during the embryonic period only in adults; it is replaced by a vertebral column.
In Chordates central nervous system is dorsal and hollow.
Phylum Chordata is divided into 3 subphyla ; Urochordata, Cephalochordata and Vertebrata.