Which of the following statement is not true?

Options

A. In plant outer layer in cell wall and in animal cell membrane
B. Dence membrane bound nucleus and semifluid matrix cytoplasm is present in eukaryote cell only
C. Cytoplasm is the main area of cellular activities in plant and animal cells
D. All are true

Answer

To determine which statement is not true, let's analyze each option step by step.

### Step-by-Step Solution:

1. **Statement A**: "In plants, the outer layer is the cell wall, and in animals, it is the cell membrane."
- **Analysis**: This statement is true. Plant cells have a rigid cell wall that provides structure and protection, while animal cells have a flexible cell membrane.

2. **Statement B**: "Dense membrane-bound nucleus and semifluid matrix cytoplasm are present in eukaryotic cells only."
- **Analysis**: This statement is not true. While eukaryotic cells do have a dense membrane-bound nucleus and cytoplasm, prokaryotic cells (like bacteria) also have cytoplasm, although they do not have a membrane-bound nucleus. Therefore, this statement is incorrect.

3. **Statement C**: "Cytoplasm is the main area of cellular activity in plants and animal cells."
- **Analysis**: This statement is true. The cytoplasm contains various organelles and is the site of many metabolic processes, making it crucial for cellular activity in both plant and animal cells.

4. **Statement D**: "All are true."
- **Analysis**: Since we have identified that Statement B is not true, this statement is also incorrect.

### Conclusion:
The statement that is not true is **Statement B**.

### Final Answer:
**Option B** is the statement that is not true.

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