Question

Which one is not the sub-phylum of chordata?(a) Hemichordara
(b) Tunicata(c) Cephalochordata
(d) Urochordata

Answer 1

Option b is the correct answer

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Answer 2

Answer:

Option a) Hemichordata is not the sub-phylum of Chordata. Whereas option b) Tunicata c) Cephalochordata and d) Urochordata, all are the sub-phylum of chordates.

Explanation: Chordata

• Subphylum Hemichordata- Previously they are considered the lowest Chordates But recently it is found that the so-called notochord of the hemichordates is not a true notochord but a stomochord. Therefore, they were removed from the chordates and are now treated as an independent invertebrate phylum. Example- Balanoglossus, saccoglossus.

• Subphylum Urochodata is also called Tunicata- They have a notochord and nerve cord present only in the tadpole-like larva. adult are sac-like, often sessile, and are encased in a protective tunic. Example- Salpa, Doliolum, etc.

• Subphylum Cephalochordata- Notochord and nerve chord are present throughout the life of an organism and along the entire length. Example- Lancelet or Amphioxus.