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NEETZoologyLocomotion and Movement

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The vertebral column of an adult human consists of 26 serially arranged units called vertebrae. Reason (R): During development, five sacral vertebrae fuse to form a single sacrum and four coccygeal vertebrae fuse to form a single coccyx. In the light of the above statements, choose the most appropr

Options

  1. ABoth Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
  2. BBoth Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
  3. CAssertion (A) is true but Reason (R) is false.
  4. DAssertion (A) is false but Reason (R) is true.

Correct answer

A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

Step-by-step solution

Assertion (A) is true because the adult human vertebral column is formed by 26 serially arranged units. Reason (R) is also true and correctly explains the Assertion. The embryonic vertebral column initially consists of 33 vertebrae. During development, the 5 sacral vertebrae fuse to form 1 sacral bone, and the 4 coccygeal vertebrae fuse to form 1 coccygeal bone. This fusion reduces the total number of individual vertebrae from 33 to 26 ( 7 cervical, 12 thoracic, 5 lumbar, 1 sacral, and 1 coccygeal) in an adult. Ans

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