Statement I: All chordates are vertebrates.
Statement II: All vertebrates are chordates.
In the light of the above statements, choose the correct answer from the options given below.

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Statement I is correct but statement II is incorrect.

Statement I is incorrect but statement II is correct.

Both statement I and statement II are correct.

Both statement I and statement II are incorrect.

answer is B.

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Detailed Solution

Phylum Chordata includes three subphyla – Urochordata, Cephalochordata, and Vertebrata. All chordates possess notochord, at least at some stage of their life history. The members of Urochordata and Cephalochordata do not possess a vertebral column. The members of subphylum Vertebrata possess notochord during the embryonic period. The notochord is replaced by a cartilaginous or bony vertebral column in the adult. Thus all vertebrates are chordates but all chordates are not vertebrates.

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