Identify the correct statement

Options

A. Plasma membrane term proposed by Schwann.
B. The layer around the animal cell first noticed by Schwann.
C. In animal cells membrane less cell organelles are only ribosomes .
D. All the about statements are correct.

Answer

To identify the correct statement from the given options, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement Analysis**:
- **Statement 1**: "Plasma membrane term was proposed by Schwan."
- This statement is **correct**. The term "plasma membrane" was indeed proposed by Theodor Schwann, who is known for his contributions to cell theory.

- **Statement 2**: "The layer around the animal cell was first noticed by Schwan."
- This statement is **incorrect**. While Schwann contributed to cell theory, the observation of the cell membrane was made by other scientists before him. Schwann focused on the concept of the cell as a unit of life.

- **Statement 3**: "In animal cells, membrane-less organelles are only ribosomes."
- This statement is **incorrect**. Ribosomes are indeed membrane-less organelles, but lysosomes, which are also mentioned, are not membrane-less; they are membrane-bound organelles. Therefore, this statement is misleading.

- **Statement 4**: "All the above statements are correct."
- This statement is **incorrect** because statements 2 and 3 are wrong.

2. **Conclusion**:
- Since only Statement 1 is correct, the answer to the question is that the correct statement is **Statement 1**.

### Final Answer:
The correct statement is: **"Plasma membrane term was proposed by Schwan."**