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NEET 2019 · BiologyPrevious Year Question

Select the correct option.

Answer: (D) There are seven pairs of vertebrosternal, three pairs of vertebrochondral and two pairs of vertebral ribs.. Answer: D.

  1. A.8th, 9th and 10th pairs of ribs articulate directly with the sternum.
  2. B.11th and 12th pairs of ribs are connected to the sternum with the help of hyaline cartilage.
  3. C.Each rib is a flat thin bone and all the ribs are connected dorsally to the thoracic vertebrae and ventrally to the sternum.
  4. D.There are seven pairs of vertebrosternal, three pairs of vertebrochondral and two pairs of vertebral ribs.✓

Correct Answer

(D) There are seven pairs of vertebrosternal, three pairs of vertebrochondral and two pairs of vertebral ribs.

Solution & Explanation

Answer: D. The first seven pairs (true ribs / vertebrosternal) attach dorsally to thoracic vertebrae and ventrally to the sternum; the 8th–10th pairs are vertebrochondral (false) ribs joining the 7th rib via hyaline cartilage and do NOT articulate directly with the sternum; the last two pairs (11th, 12th) are floating ribs, not connected ventrally. So option D correctly states seven vertebrosternal, three vertebrochondral and two vertebral (floating) pairs. Options A, B and C are factually wrong on these counts/attachments. NCERT Ch 17, p.225, line 32: "The 8th, 9th and 10th pairs of ribs do not"

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