NTA Abhyas NEET2020BotanyAnimal KingdomPractice
Which of the following statements is correct for the phylum whose organisms are characterized by the presence of a dorsal hollow nerve cord and paired pharyngeal gill slits?
Options
- AIn all protochordates, notochord extends from head to tail region and is persistent throughout the life.
- BThe members of the class to which Myxine belongs show the presence of a sucking and circular mouth without jaw
- CMembers of the class Osteichthyes show the presence of an air bladder, a streamlined body and four gills cover
- DThe members of the class to which the frog belongs are cold blooded, show external fertilization and a three c
Correct answer
B. The members of the class to which Myxine belongs show the presence of a sucking and circular mouth without jaw
Step-by-step solution
The phylum whose organisms are characterized by the presence of a dorsal hollow nerve cord and paired pharyngeal gill slits is Phylum Chordata. It is divided into three sub-phyla i.e. Urochordata, Cephalochordata and Vertebrata. Urochordates and Cephalochordates are together referred to as protochordates. Urochordates show the presence of notochord only in the larval tail. Cephalochordates show the presence of notochord from head to tail and is persistent throughout life. Myxine belongs to the class Cyclostomata. I