ZoologyOut of ‘X’ serially arranged units of vertebrae in humans only ‘Y’ and ‘Z’ are fused units. Select the option that correctly represents the value of X and provides Y and Z explanation. XYZ 1)26sternumcoccyxThree bones are fused to form sternum and four caudal vertebrae are fused to form coccyx2)26sacrumcoccyxFive sacral vertebrae and four coccygeal vertebrae are fused to form sacrum and coccyx.3)33coccyxsacrumFive caudal vertebrae and four sacral vertebrae are fused to form coccyx and sacrum4)33cervicumsacrumSeven cervical vertebrae and four sacral vertebrae are fused to form cervicum and sacrum.

Out of ‘X’ serially arranged units of vertebrae in humans only ‘Y’ and ‘Z’ are fused units. Select the option that correctly represents the value of X and provides Y and Z explanation.

 XYZ 
1)26sternumcoccyxThree bones are fused to form sternum and four caudal vertebrae are fused to form coccyx
2)26sacrumcoccyxFive sacral vertebrae and four coccygeal vertebrae are fused to form sacrum and coccyx.
3)33coccyxsacrumFive caudal vertebrae and four sacral vertebrae are fused to form coccyx and sacrum
4)33cervicumsacrumSeven cervical vertebrae and four sacral vertebrae are fused to form cervicum and sacrum.

  1. A

    1

  2. B

    2

  3. C

    3

  4. D

    4

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    Solution:

    X = 26, Y = Sacrum, formed by the fusion of five sacral vertebrae. Z = Coccyx, formed by the fusion of four coccygeal vertebrae.

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