Question

Which of the following is not characteristic of hemichordates
(A) Presence of stomochord
(B) Excretion by proboscis gland
(C) Closed type of circulation
(D) Respiration through gills​

Answer 1

Answer:

C

Explanation:

hemichordates have open type of circulatory system

Answer 2

Answer:

A closed type of circulation is not the characteristic of hemichordates. The correct option is (C)

Explanation:

• Stomochord or buccal diverticulum is present in hemichordates. It is a mesodermal outgrowth that arises from the roof of the buccal cavity.
• Many pairs of gill slits are present in the pharyngeal region for branchial respiration.
• The proboscis gland or glomerulus is present and used as an organ of excretion.
• The circulatory system is an open type.

Hence, a closed type of circulation is not the characteristic of hemichordates and the correct option is (C)