Match the following.
`{:("List-I","List-II"),("I) Tight junctions","A) Cement neighbouring cells"),( "II) Gap junctions","B) Stop leakage of substances"),("III) Adhering junctions","C) rapid transfer of ions"),("IV) Epithelia","D) Upon growing "):}`

Options

A. I-B, II-C, III-D, IV-A
B. I-B, II-C, III-A, IV-D
C. I-D, II-B, III-C, IV-A
D. I-C, II-B, III-D, IV-A

Answer

To solve the matching question, we will analyze each item in List-I and find the corresponding item in List-II based on their definitions and functions.

### Step-by-Step Solution:

1. **Tight Junctions (I)**:
- **Definition**: Tight junctions are intercellular adhesion complexes found in epithelial and endothelial tissues.
- **Function**: They prevent the passage of molecules and ions through the spaces between adjacent cell membranes, effectively stopping leakage of substances across a tissue.
- **Match**: Therefore, Tight Junctions (I) match with **B) Stop leakage of substances**.

2. **Gap Junctions (II)**:
- **Definition**: Gap junctions are channels that connect adjacent cells.
- **Function**: They facilitate the rapid exchange of small molecules and ions between cells, playing a crucial role in physiological processes such as those in the nervous system.
- **Match**: Thus, Gap Junctions (II) match with **C) Rapid transfer of ions**.

3. **Adhering Junctions (III)**:
- **Definition**: Adhering junctions are cell-to-cell adhesive complexes that are continuously assembled and disassembled.
- **Function**: They help in maintaining the structural integrity of tissues by cementing neighboring cells together.
- **Match**: Hence, Adhering Junctions (III) match with **A) Cement neighbouring cells**.

4. **Epithelia (IV)**:
- **Definition**: Epithelia are continuous sheets of cells that cover the body’s exterior surfaces and line internal cavities and tubes.
- **Function**: These cells are continuously renewed through processes of cell division, maturation, and migration, indicating they are always growing.
- **Match**: Therefore, Epithelia (IV) match with **D) Upon growing**.

### Final Matches:
- I) Tight junctions → B) Stop leakage of substances
- II) Gap junctions → C) Rapid transfer of ions
- III) Adhering junctions → A) Cement neighbouring cells
- IV) Epithelia → D) Upon growing