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Question
The notochord is persistent throughout life in
The notochord is persistent throughout life in
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Solution
The correct option is B cephalochordates
The notochord is persistent throughout life in cephalochordates.
It is a supporting rod-like structure present on the dorsal side of the chordates. In cephalochordates, the notochord extends from head to the tail region and is persistent throughout the life of the organism.
In urochordates, the notochord is present only in the tail of the larva. The larva undergoes a metamorphosis. Metamorphosis is a process of transformation of an immature larva into a mature adult. When the larva undergoes metamorphosis, the adult loses its tail and hence the notochord is lost.
In the vertebrates, the notochord is present in the embryonic stage. It gets replaced by the vertebral column in the adult stage.
Hence, the notochord is persistent throughout the life in cephalochordates.
The notochord is persistent throughout life in cephalochordates.
It is a supporting rod-like structure present on the dorsal side of the chordates. In cephalochordates, the notochord extends from head to the tail region and is persistent throughout the life of the organism.
In urochordates, the notochord is present only in the tail of the larva. The larva undergoes a metamorphosis. Metamorphosis is a process of transformation of an immature larva into a mature adult. When the larva undergoes metamorphosis, the adult loses its tail and hence the notochord is lost.
In the vertebrates, the notochord is present in the embryonic stage. It gets replaced by the vertebral column in the adult stage.
Hence, the notochord is persistent throughout the life in cephalochordates.
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