Assertion : Cell junctions are present in the epithelium and other tissues
Reason : Among cell junctions, adhering junctions help to stop substances from leaking across a tissue

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false

Explanation

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

### Step 1: Understand the Assertion
The assertion states that "Cell junctions are present in the epithelium and other tissues."
- **Explanation**: This statement is true. Cell junctions are indeed found in epithelial tissues and other types of tissues in animals. They play a crucial role in maintaining the structure and function of tissues by holding cells together.

### Step 2: Understand the Reason
The reason states that "Among cell junctions, adhering junctions help to stop substances from leaking across a tissue."
- **Explanation**: This statement is false. Adhering junctions primarily provide mechanical support and help in cementing cells together. The junction that prevents leakage of substances between cells is the tight junction, not the adhering junction.

### Step 3: Evaluate the Relationship between Assertion and Reason
Now we need to determine the relationship between the assertion and the reason.
- The assertion is true, but the reason is false. Therefore, the correct conclusion is that the assertion is true, but the reason does not correctly explain the assertion.

### Conclusion
Based on the evaluation:
- The correct answer is: **Assertion is true but reason is false.**