Neighbouring cells are adjoined by

Options

A. Middle lamellum
B. Primary cell wall
C. Secondary cell wall
D. Plasma membrane

Answer

**Step-by-Step Solution:**

1. **Understanding Cell Structure**: Begin by recognizing that cells are the basic units of life and can be found in various forms, such as plant cells and animal cells. In plants, neighboring cells are often connected to each other.

2. **Identifying Cell Connections**: In plant cells, neighboring cells are connected through structures that facilitate adhesion and communication. This is crucial for maintaining tissue integrity and function.

3. **Defining Middle Lamella**: The specific structure that joins neighboring plant cells is called the middle lamella. It is a thin layer that lies between the cell walls of adjacent cells.

4. **Function of Middle Lamella**: The middle lamella is primarily composed of pectins, which help in cementing the cell walls together. This structure allows for the adhesion of cells, ensuring that they remain connected.

5. **Additional Information**: It is important to note that the middle lamella can dissolve in certain conditions, such as when fruit ripens or leaves senesce (age). This dissolution leads to the softening of the fruit or leaf, which is why ripe fruits often feel softer and may eventually fall from the plant.

6. **Conclusion**: Therefore, the answer to the question "Neighboring cells are adjoined by" is the middle lamella.

**Final Answer**: Neighboring cells are adjoined by the middle lamella.

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