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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): All 12 pairs of ribs in humans are called bicephalic. Reason (R): All ribs articulate ventrally with the sternum with the help of hyaline cartilage. In the light of the above statements, choose the correct answer from the options given below:

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 false but Reason (R) is true.
  4. DAssertion (A) is true but Reason (R) is false.

Correct answer

D. Assertion (A) is true but Reason (R) is false.

Step-by-step solution

Assertion (A) is true because each rib has two articulation surfaces on its dorsal end where it connects to the vertebral column, and is hence called bicephalic. This applies to all 12 pairs of ribs. Reason (R) is false because only the first seven pairs of ribs (true ribs) are ventrally connected to the sternum with the help of hyaline cartilage. The 8th, 9th, and 10th pairs join the seventh rib, and the 11th and 12th pairs (floating ribs) are not connected ventrally at all. Therefore, Assertion (A) is true but Re

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