The type of cell junctions that helps in preventing leakage of substances is calles

Options

A. Adhering junctions
B. Gap junctions
C. Tight junctions
D. Plasmodesmata

Answer

To solve the question regarding the type of cell junctions that helps in preventing leakage of substances, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Cell Junctions**: Begin by recognizing that there are different types of cell junctions in both animal and plant cells. The main types include adhering junctions, gap junctions, tight junctions, and plasmodesmata.

2. **Evaluating Adhering Junctions**: Adhering junctions primarily function to provide adhesion between cells. They help in maintaining the structural integrity of tissues but do not prevent leakage of substances. Therefore, this option is not correct.

3. **Evaluating Gap Junctions**: Gap junctions are specialized intercellular connections that allow for communication between adjacent cells. They consist of channels that permit the passage of ions and small molecules. However, they do not prevent leakage; instead, they facilitate the movement of substances. Thus, this option is also incorrect.

4. **Evaluating Tight Junctions**: Tight junctions are formed by tightly packed cells that create a barrier to prevent the leakage of substances between them. They are crucial in epithelial tissues where controlling the passage of materials is essential. This option is correct as tight junctions effectively prevent leakage.

5. **Evaluating Plasmodesmata**: Plasmodesmata are channels found in plant cells that allow for the transport of substances between cells. They function similarly to gap junctions in animals but do not serve the purpose of preventing leakage. Hence, this option is not correct.

6. **Conclusion**: After evaluating all the options, the type of cell junction that helps in preventing leakage of substances is **tight junctions**.

### Final Answer:
The correct answer is **tight junctions**.