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Question
The notochord is present throughout the life in organisms belonging to which of the following group?
The notochord is present throughout the life in organisms belonging to which of the following group?
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Solution
The correct option is D Both A and B
Cephalochordates are a group of organisms in which the notochord extends from head to tail region and is persistent throughout their life. Agnatha is a group of vertebrates that lacks jaw and notochord is present in both larvae and adult forms. While in Gnathostomata (jawed vertebrates) notochord is replaced by a vertebral column in adults.In Urochordata, the notochord is present only in the larval tail. So, the correct option is 'Agnatha and Cephalochordata'.
Cephalochordates are a group of organisms in which the notochord extends from head to tail region and is persistent throughout their life. Agnatha is a group of vertebrates that lacks jaw and notochord is present in both larvae and adult forms. While in Gnathostomata (jawed vertebrates) notochord is replaced by a vertebral column in adults.
In Urochordata, the notochord is present only in the larval tail.
So, the correct option is 'Agnatha and Cephalochordata'.
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