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.

Q. Which of the following statements are true for the phylum Chordata?

(a) In cephalochordates, notochord extends from head to tail
(b) Urochordates are exclusively marine
(c) Notochord is dorsal to nerve cord
(d) All vertebrates are jawed

Q. 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.

Q. Statement 1: Cephalochordata bears notochord all along the body throughout life.
Statement 2: Urochordate bears vertebral columns only in the tail region throughout life.
Which of the statement(s) is/are correct?

Q. In _______, notochord is present only in larval tail while in ________, it extends from head to tail region and is persistent throughout their life.

Q. Which of the following statements are true for phylum Chordata?
a. In cephalochordates, notochord extends from head to tail and it is present throughout their life
b. All vertebrates are chordates but all chordates are not vertebrates
c. Central neural system is dorsal and solid
d. Chordates are divided into two subphyla, Agnatha and Gnathostomata