The structure that acts as intercellular cementing substance and binds adjacent cells together is

Options

A. Desmosome
B. Primary cellwall
C. Middle lamellum
D. Secondary cellwall

Answer

To answer the question, "The structure that acts as intercellular cementing substance and binds adjacent cells together is," we will analyze the options provided and explain the reasoning behind the correct answer step by step.

### Step-by-Step Solution:

1. **Understanding Cell Wall Structures**:
- The plant cell wall consists of three main structures: the primary cell wall, the middle lamella, and the secondary cell wall. Each of these structures has distinct roles.

2. **Identifying the Middle Lamella**:
- The middle lamella is located between the primary cell walls of adjacent plant cells. It is often referred to as the "cementing layer" because it helps to bind the cells together.

3. **Function of the Middle Lamella**:
- The primary function of the middle lamella is to act as an intercellular cementing substance. It connects the primary cell walls of neighboring cells, thereby providing structural integrity to the plant tissue.

4. **Composition of the Middle Lamella**:
- The middle lamella is primarily composed of pectin, a polysaccharide that gives it adhesive properties. This composition allows it to effectively bind adjacent cells together.

5. **Conclusion**:
- Based on the above points, the structure that acts as the intercellular cementing substance and binds adjacent cells together is the **middle lamella**.

### Final Answer:
The correct answer is **middle lamella**.

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