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Chordata/Vertebrata

Question

What is the fate of notochord in higher chordates?
The notochord is replaced by the vertebral column.
The notochord is replaced by a nerve cord.
The notochord is not present in chordates.
The notochord is present throughout the life of higher chordates.

A

The notochord is replaced by a nerve cord.

B

The notochord is replaced by the vertebral column.

C

The notochord is present throughout the life of higher chordates.

D

The notochord is not present in chordates.

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Solution

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Chordates are characterized by the presence of a notochord.
However, the notochord is replaced by a vertebral column, in some higher chordates like birds, mammals, etc.
The vertebral column encloses the spinal cord and protects it.

Therefore, the correct answer is option A.

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