Question

ossification is the process where __________.
○ bone tissue is replaced by cartilage tissue in the skeleton
○ bone is recycled in an adult skeleton
○ bone is repaired after a fracture
○ cartilage tissue is replaced by bone tissue in the skeleton

Explanation:

Ossification (osteogenesis) is the process of bone formation. During development, cartilage models of bones are replaced by bone tissue. Let's analyze each option:

• First option: Ossification is bone formation, not bone being replaced by cartilage. So this is incorrect.
• Second option: Bone recycling in adults is bone remodeling, not ossification. So this is incorrect.
• Third option: Bone repair after fracture is part of bone remodeling/repair, not the main definition of ossification (which is about bone formation during development or growth). So this is incorrect.
• Fourth option: This matches the definition of ossification, where cartilage (in the embryonic skeleton or growth plates) is replaced by bone tissue.

Answer:

D. Cartilage tissue is replaced by bone tissue in the skeleton (assuming the options are labeled A, B, C, D in order, with the fourth option being D)