Question

Which of the following is not a character of phylum Hemichordata?

• A. Presence of stomochord which is mesodermal in origin
• B. Excretory organ is proboscis gland
• C. Circulatory system is open
• D. Respiration takes place through gills

Answer 1

Answer: (A)

Presence of stomochord which is mesodermal in origin

Phylum Hemichordata consists of a small group of worm-like marine animals with an organ-system level of organisation. The body is cylindrical and is composed of an anterior proboscis, a collar, and a long trunk. The circulatory system is of open type. Respiration takes place through gills. The excretory organ is proboscis gland.

So the correct option is "Presence of stomochord which is mesodermal in origin".