Which term refers to the ribs that don’t attach to the sternum at all?

Correct Answer: B

Rationale: Ribs 11 and 12 are 'floating ribs,' lacking any attachment to the sternum, unlike false ribs (8–10), which connect indirectly via cartilage. 'Loose' is not a standard term here.

Correct Answer: A

Rationale: The tibia, the larger leg bone, bears most of the body’s weight and has a fibular notch distally to articulate with the fibula, stabilizing the ankle.

Correct Answer: D

Rationale: The sternum (breastbone) is part of the axial skeleton, forming the thoracic cage with the ribs to protect the heart and lungs. Scapula (shoulder blade), humerus (upper arm), and femur (thigh) are appendicular skeleton bones, involved in limb movement, not axial support.

Correct Answer: C

Rationale: The synovial membrane, lining synovial joint cavities, produces synovial fluid to lubricate and nourish the joint, reducing friction. Cartilage covers bone ends, ligaments connect bones, and periosteum covers bone surfaces—none produce this fluid.