Question

Read the assertion and reason carefully to mark the correct option in question.
Assertion: Human ribs are called bicephalic.
Reason: Ribs have two articulation surfaces on their dorsal ends.

• A. If both assertion and reason are false.
• B. If assertion is true but the reason is false.
• C. If both assertion and reason are true and the reason is the correct explanation of the assertion.
• D. If both assertion and reason are true but the reason is not the correct explanation of the assertion.

Answer 1

The correct option is C If both assertion and reason are true and the reason is the correct explanation of the assertion.

Assertion-Reason relation
Ribs are 12 pairs of flat bones which protect organs present in the thoracic cavity of the body as well as kidneys. Ribs are bicephalic (have two heads) i.e., they have two articulation surfaces on their dorsal side.
Hence, the given assertion- “Human ribs are called bicephalic” is true.
Ribs are dorsally connected to the vertebral column and most of them are ventrally connected to the sternum. Ribs are referred to as bicephalic as they have two attachment surfaces at their dorsal ends.
Hence, the given reason- “Ribs have two articulation surfaces on their dorsal ends” is true and is the correct explanation of the given assertion.
Final answer
(A) If both assertion and reason are true and the reason is the correct explanation of the assertion.