Assertion `:-` Skeletal muscle fibre is synctium as the sarcoplasm contains many nuclei.
Reason `:-` The sarcoplasmic reticulum of the muscle fibre is the store house of calcium ions.
(a) If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion .
(b) If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion
(c) If Assertion is True but the Reason is False.
(d) If both Assertion & Reason are false.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion .
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion
C. If Assertion is True but the Reason is False.
D. If both Assertion & Reason are false.

Answer

To solve the question, we need to analyze both the assertion and the reason provided:

### Step 1: Analyze the Assertion
- The assertion states that "Skeletal muscle fibre is a syncytium as the sarcoplasm contains many nuclei."
- A syncytium is a multinucleated cell that results from the fusion of multiple cells. Skeletal muscle fibers are indeed multinucleated because they form from the fusion of myoblasts during development. Therefore, the assertion is **True**.

### Step 2: Analyze the Reason
- The reason states that "The sarcoplasmic reticulum of the muscle fibre is the storehouse of calcium ions."
- The sarcoplasmic reticulum (SR) is a specialized form of endoplasmic reticulum in muscle cells that stores calcium ions, which are crucial for muscle contraction. This statement is also **True**.

### Step 3: Determine the Relationship
- Now we need to determine if the reason correctly explains the assertion. The assertion is about the multinucleated nature of skeletal muscle fibers, while the reason discusses the function of the sarcoplasmic reticulum in storing calcium ions.
- Although both statements are true, the reason does not explain why skeletal muscle fibers are considered a syncytium. Therefore, the reason is **not a correct explanation** of the assertion.

### Conclusion
- Since both the assertion and reason are true, but the reason does not explain the assertion, the correct answer is:
**(b) If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.**