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In which of the following, notochord is present in embryonic stage? (a) all chordates (b) some...

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

(a) all chordates

(b) some chordates

(c) vertebrates

(d) non chordates.

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Answer #1

Correct Answer- (a) all chordates

The notochord is a flexible rod made out of a material similar to cartilage. If a species has a notochord at any stage during its life cycle, it is, by definition, a chordate. Notochord is the primary axial supportive structure present in all chordate embryos-as well as in many adults. In a vast majority, it is replaced by vertebral column in adults. Vertebrates come under the category of chordate. Non chordates do not contain notochord.

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