Question

Which of the following statements is correct for urochordates?
(1) Often referred to as protochordates
(2) Presence of thyroid gland
(3) Notochord at tail only in larval stage
(4) Excretion by proboscis gland

• A. 1 and 3
• B. 1 and 2
• C. 3 and 4
• D. 1 and 4

Answer 1

The correct option is A 1 and 3

Phylum Chordata is divided into three subphyla: Urochordata or Tunicata, Cephalochordata and Vertebrata.

Subphyla Urochordata and Cephalochordata are often referred to as protochordates and are exclusively marine. In Urochordata, notochord is present only in larval tail.