Select the correct option.

A \(8^{\text {th }}\), \(9^{\text {th} }\)\(\text { and } 10^{\text {th }}\) pairs of ribs articulate directly with the sternum.
B \(11^{\text {th }}\) and \(12^{\text {th }}\) pairs of ribs are connected to the stemum with the help of hyaline cartilage.
C Each rib is a flat thin bone and all the ribs are connected dorsally to the thoracic vertebrae and ventrally to the sternum.
D There are seven pairs of vertebrostemal, three pairs of vertebrochondral and two pairs of vertebral ribs.

Verified Solution

Answer & Solution

Correct Answer

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

Step-by-step Solution

Detailed explanation

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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(a) Ophura	(i) Mollusca
(b) Physalia	(ii) Platyhelminthes
(c) Pinctada	(iii) Echinodermata
(d) Planaria	(iv) Coelenterata