Which of the following statement is incorrect w.r.t plasma membrane ?

Options

A. It is selectively permeable
B. It is made up of lipids carbohydrates and proteins
C. It is permeable
D. it helps in endocytosis process

Answer

To determine which statement is incorrect with respect to the plasma membrane, let's analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Selective Permeability**:
- The first statement claims that the plasma membrane is selectively permeable. This means it allows only certain molecules to pass through while restricting others. This is a characteristic feature of the plasma membrane.
- **Conclusion**: This statement is **correct**.

2. **Composition of the Plasma Membrane**:
- The second statement asserts that the plasma membrane is made up of lipids, carbohydrates, and proteins. The plasma membrane consists primarily of a lipid bilayer (phospholipids), along with embedded proteins and carbohydrate chains attached to lipids and proteins.
- **Conclusion**: This statement is also **correct**.

3. **General Permeability**:
- The third statement states that the plasma membrane is permeable. However, being "permeable" implies that it allows all molecules to pass through without restriction. Since we previously established that the plasma membrane is selectively permeable, this statement contradicts that definition.
- **Conclusion**: This statement is **incorrect**.

4. **Role in Endocytosis**:
- The fourth statement mentions that the plasma membrane helps in the process of endocytosis. Endocytosis is a mechanism where the cell membrane engulfs substances from the outside, forming vesicles to internalize them. This is indeed a function of the plasma membrane.
- **Conclusion**: This statement is **correct**.

### Final Answer:
The incorrect statement with respect to the plasma membrane is that it is "permeable" (option C).

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