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.
- A(d) and (c)
- B(c) and (a)
- C(a) and (b)
- D(b) and (c)
Solution & Step-by-step Explanation
Statement (a) is false: In Urochordata, notochord is present only in larval tail. In Cephalochordata, it extends from head to tail and is persistent throughout life.
Statement (b) is true: In Vertebrata, the notochord is replaced by a cartilaginous or bony vertebral column in the adult.
Statement (c) is true: Chordates have a dorsal, hollow CNS.
Statement (d) is false: Chordata is divided into Urochordata (Tunicata), Cephalochordata, and Vertebrata. Hemichordata is a separate phylum.
Statement (b) is true: In Vertebrata, the notochord is replaced by a cartilaginous or bony vertebral column in the adult.
Statement (c) is true: Chordates have a dorsal, hollow CNS.
Statement (d) is false: Chordata is divided into Urochordata (Tunicata), Cephalochordata, and Vertebrata. Hemichordata is a separate phylum.