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In vertebrates
Option: 1
The notochord persists for lifetime
Option: 2
The notochord is absent altogether
Option: 3
The notochord is replaced by bony spine
Option: 4
The notochord reappears in old age
Answers (1)
Notochord:
- It is the rod-like cartilaginous structure that is present dorsally during the development of embryo in animals.
- It is derived from the mesoderm.
- Those animals that do not possess notochord at any stage of their life cycles are called non-chordates. They are also called invertebrates. For example, sponges, coelenterates, Platyhelminthes etc.
- Those animals that possess the notochord either throughout or at any stage of their life cycles are called chordates. For example, hemichordates, urochordates etc.
- In some chordates, the notochord is replaced by a bony vertebral column. Such animals are called vertebrates. For example, mammals.
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