Question

Which of the following statements are true for the phylum - chordata?
(a) In urochordata notochord extends from head to tail and it is present throughtout 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.

• A. (a) and (b)
• B. (b) and (c)
• C. (d) and (c)
• D. (c) and (a)

Answer 1

The correct option is B (b) and (c)

(a) 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.
(b) Vertebrata possess notochord during the embryonic period. The notochord is replaced by a cartilaginous or bony vertebral column in the adult.
(c) In chordates, the central nervous system is dorsal and hollow.
(d) Phylum chordata is divided into three subphyla: Urochordata or Tunicata, Cephalochordata and Vertebrata.