Question

In which of the following the notochord is present only in embryonic stage?

• A. Vertebrates
• B. Some chordates
• C. All chordates
• D. Non-chordates

Answer 1

The correct option is A Vertebrates

The notochord is present in the embryonic stage of the vertebrates. It is a flexible, rod-like structure of mesodermal cells. In later vertebrate development, it becomes part of the vertebral column and helps in muscle attachment.
Therefore, the correct answer is option A.