Biology · Support and Movement

The correct answer is Option A: Condyloid joint is triaxial. Condyloid joints are biaxial, allowing movement in two planes but not rotation, which means they are not triaxial. Examples of condyloid joints include the wrist joint (radiocarpal joint). Option B is true because synovial fluid reduces friction in synovial joints. Option C is also true; the coronal suture connects the parietal and frontal bones. Finally, Option D is correct in stating that synostosis is a bony joint, as it involves the fusion of bones into a single unit.

Condyloid joints allow movement in two planes (biaxial), such as flexion-extension and abduction-adduction. They do not permit rotation, thus they are not triaxial. Examples include the radiocarpal joint in the wrist.

Synovial fluid is a viscous fluid found within synovial joints. Its primary role is to lubricate the joint, thereby reducing friction between the articulating surfaces during movement.

The coronal suture is indeed the fibrous joint that connects the parietal bones to the frontal bone of the skull.

Synostosis refers to the fusion of two or more bones into a single bone, forming a bony joint. This process eliminates the joint, resulting in a rigid structure.