Question

Match List-I with List-II (Types of cells in bone tissue with their description) 
 \[ \begin{array}{|l|l|} \hline \textbf{LIST I} & \textbf{LIST II} \\ \hline A. \ \text{Osteoclasts} & I. \ \text{Mature bone cells} \\ B. \ \text{Osteoblasts} & II. \ \text{Huge cells derived from fusion of monocytes} \\ C. \ \text{Osteocytes} & III. \ \text{Unspecialized bone stem cells from mesenchyme} \\ D. \ \text{Osteoprogenitor cells} & IV. \ \text{Bone building cells} \\ \hline \end{array} \]

• A. (A)-(II), (B)-(IV), (C)-(I), (D)-(III)
• B. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
• C. (A)-(III), (B)-(IV), (C)-(I), (D)-(II)
• D. (A)-(IV), (B)-(III), (C)-(II), (D)-(I)
• E.

Hint:

Osteoclasts = Bone resorption, Osteoblasts = Bone building, Osteocytes = Mature cells, Osteoprogenitors = Stem cells.

Answer 1

The Correct Option is A

Step 1: Role of osteoclasts.
Osteoclasts are large multinucleated cells derived from monocytes.
Their function is bone resorption — breaking down old bone tissue.
Hence, osteoclasts correspond to (II).
Step 2: Role of osteoblasts.
Osteoblasts are bone-forming cells.
They secrete osteoid (bone matrix) which later mineralizes to form hard bone.
Thus, osteoblasts correspond to (IV).
Step 3: Role of osteocytes.
Osteocytes are mature bone cells derived from osteoblasts that have become embedded in bone matrix.
They maintain bone tissue and communicate via canaliculi.
Thus, osteocytes correspond to (I).
Step 4: Role of osteoprogenitor cells.
These are undifferentiated stem cells derived from mesenchyme.
They differentiate into osteoblasts when needed.
Thus, osteoprogenitor cells correspond to (III).
Step 5: Conclusion.
So the correct matching is:
(A)-(II), (B)-(IV), (C)-(I), (D)-(III).