Pit membrane is actually

Options

A. primary wall
B. tertiary wall
C. secondary wall
D. cell membrane

Answer

To answer the question "Pit membrane is actually," we need to analyze the options provided and understand the structure of the pit membrane in plant cells.

### Step-by-Step Solution:

1. **Understanding Pits**:
- Pits are specialized structures in the cell wall of plant cells. They are thin regions that allow for communication and transport of substances between adjacent cells.

2. **Components of Pits**:
- A pit consists of three main parts:
- **Pit Chamber**: The space where the pit is located.
- **Pit Aperture (Pit Pore)**: The opening through which substances can pass.
- **Pit Membrane**: The membrane that forms the boundary of the pit chamber.

3. **Composition of the Pit Membrane**:
- The pit membrane is primarily composed of two elements:
- **Primary Wall**: The first layer of the cell wall that is formed during cell growth.
- **Middle Lamella**: A layer that is rich in pectin and acts as a glue between the primary walls of adjacent cells.

4. **Evaluating the Options**:
- Now, let's evaluate the options given in the question:
- **Option A: Primary Wall** - This is part of the composition of the pit membrane.
- **Option B: Tertiary Wall** - This is not relevant to the pit membrane.
- **Option C: Secondary Wall** - This is also not part of the pit membrane.
- **Option D: Cell Membrane** - This is not related to the pit structure.

5. **Conclusion**:
- Since the pit membrane is made up of the primary wall and the middle lamella, the correct answer to the question "Pit membrane is actually" is **Option A: Primary Wall**.

### Final Answer:
**Pit membrane is actually the Primary Wall (Option A).**