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Question
Which of the following statements is (are) not true?
(A) In Urochordata, the notochord is present only in the larval tail.
(B) In Cephalochordata, notochord extends from head to tail region.
(C) Branchiostoma belongs to Hemichordata
(D) Only one class of living members, class Cyclostomata represents the superclass Agnatha.
Which of the following statements is (are) not true?
(A) In Urochordata, the notochord is present only in the larval tail.
(B) In Cephalochordata, notochord extends from head to tail region.
(C) Branchiostoma belongs to Hemichordata
(D) Only one class of living members, class Cyclostomata represents the superclass Agnatha.
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Solution
The correct option is B C only
Urochordates or tunicates are marine organisms. These are filter-feeding animals. When the larva undergoes metamorphosis, the notochord in the tail and nerve cord degenerates. This is called retrogressive metamorphosis. There is a loss of advanced features while the development of larvae to adult.
The cephalochordates or lancelets have a long body. The body tapers or is pointed at both ends with a large notochord, that extends from tip to tip and is present throughout life.
Branchiostoma is one of the few living genera of lancelets or cephalochordates. It is not a hemichordate. These are snake-like organisms. There is dorsal nerve cord. They are close relatives of vertebrates.
Agnatha is a superclass of jawless fish in the phylum Chordata and subphylum Vertebrata. The group consists both present (living) cyclostomes and extinct conodonts and ostracoderms.
Thus, the correct answer is option C.
Urochordates or tunicates are marine organisms. These are filter-feeding animals. When the larva undergoes metamorphosis, the notochord in the tail and nerve cord degenerates. This is called retrogressive metamorphosis. There is a loss of advanced features while the development of larvae to adult.
The cephalochordates or lancelets have a long body. The body tapers or is pointed at both ends with a large notochord, that extends from tip to tip and is present throughout life.
Branchiostoma is one of the few living genera of lancelets or cephalochordates. It is not a hemichordate. These are snake-like organisms. There is dorsal nerve cord. They are close relatives of vertebrates.
Agnatha is a superclass of jawless fish in the phylum Chordata and subphylum Vertebrata. The group consists both present (living) cyclostomes and extinct conodonts and ostracoderms.
Thus, the correct answer is option C.
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