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NTA Abhyas NEET2020BotanyAnimal KingdomPractice

Which one of the following statements is totally wrong about the occurrence of notochord, while the other three are CORRECT?

Options

  1. AIt is present only in larval tail in Ascidians.
  2. BIt is replaced by a vertebral column in frog.
  3. CIt is absent throughout life in humans from the very beginning.
  4. DIt is present throughout life in Amphioxus.

Correct answer

C. It is absent throughout life in humans from the very beginning.

Step-by-step solution

Animal kingdom is divided into two main groups Non Chordates and Chordates on the basis of absence and presence of notochord. Non chordates include Phylum porifera to phylum Echinoderms. Chordates are further divided into Protochordates and Vertebrates. These animals are classified on the basis of when is notochord present and whether it forms vertebral column or not. Protochordates include Urochordates and Cephalochordates. Urochordates include those animals that show presence of notochord in the tail region. Exam

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