………... concluded that the presence of cell wall is a unique character of plant cells .

Options

A. T . Schwann
B. M. Schleiden
C. R. Virchow
D. R. Brown

Answer

To solve the question regarding who concluded that the presence of a cell wall is a unique character of plant cells, we can follow these steps:

### Step 1: Identify the Key Concept
The question asks about the scientist who recognized the cell wall as a unique feature of plant cells.

**Hint:** Think about the characteristics that differentiate plant cells from animal cells.

### Step 2: Recall Relevant Scientists
Consider notable scientists in the field of cell biology. One prominent figure is Theodor Schwann, but he is known for his work on animal cells.

**Hint:** Focus on scientists who specifically studied plant cells and their structures.

### Step 3: Review Historical Contributions
The video mentions a scientist who discovered pepsin and made conclusions about the cell wall. This points towards a specific individual who contributed to our understanding of plant cell structure.

**Hint:** Look for scientists who have made significant contributions to both plant biology and cell theory.

### Step 4: Identify the Correct Scientist
The video indicates that the correct answer is option 1, which refers to a scientist who discovered pepsin and concluded that the cell wall is a unique feature of plant cells. This scientist is likely to be Matthias Schleiden, who, along with Theodor Schwann, contributed to the cell theory.

**Hint:** Remember that Schleiden focused on plant cells, while Schwann focused on animal cells.

### Step 5: Confirm the Conclusion
Based on the information provided, the conclusion is that the presence of a cell wall is indeed a unique characteristic of plant cells, as stated by the identified scientist.

**Final Answer:** The correct answer is Matthias Schleiden.

### Summary
1. Identify the unique feature of plant cells (cell wall).
2. Recall relevant scientists and their contributions.
3. Review historical context and contributions to cell theory.
4. Identify the correct scientist (Matthias Schleiden).
5. Confirm the conclusion regarding the uniqueness of the cell wall in plant cells.