Question

Read the following statements.

(a) Three subphyla of phylum Chordata are Tunicata, Cephalochordata and Vertebrata.
(b) In Ascidia, notochord is present only in larval tail.
(c) Notochord persists throughout life in all vertebrates.
(d) Nerve cord is ventral, solid and double in chordates.

Choose the option with only incorrect statements.

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

Answer 1

The correct option is D (c) and (d) are incorrect

CNS is dorsal, hollow and single in chordates. In vertebrates, notochord converts into bony or cartilaginous vertebral column.