Mark the incorrect statement -

Options

A. Ribosomes are non-membrane bound organelles found in all cells – both eukaryotic as well as prokaryotic.
B. Cells that have membrane bound nuclei are called eukaryotic whereas cells that lack a membrane bound nucleus are prokaryotic.
C. All eukaryotic cells are identical.
D. Animal cells have centrioles which are absent in almost all plant cells.

Answer

To identify the incorrect statement from the options provided, let's analyze each statement one by one:

### Step 1: Analyze Option A
**Statement:** Ribosomes are non-membrane bound organelles found in all cells, both eukaryotic as well as prokaryotic cells.

**Analysis:** This statement is correct. Ribosomes are indeed non-membrane bound organelles and are present in both eukaryotic and prokaryotic cells.

### Step 2: Analyze Option B
**Statement:** Cells that have membrane-bound nuclei are called eukaryotic cells, whereas cells that lack a membrane-bound nucleus are called prokaryotic cells.

**Analysis:** This statement is also correct. Eukaryotic cells have a well-defined nucleus surrounded by a nuclear membrane, while prokaryotic cells do not have a membrane-bound nucleus.

### Step 3: Analyze Option C
**Statement:** All eukaryotic cells are identical.

**Analysis:** This statement is incorrect. Eukaryotic cells can be very different from one another. For example, plant cells and animal cells have distinct structures and functions, such as the presence of chloroplasts in plant cells and the presence of centrioles in animal cells.

### Step 4: Analyze Option D
**Statement:** Animal cells have centrioles, which are absent in almost all plant cells.

**Analysis:** This statement is correct. Centrioles are typically found in animal cells and are generally absent in plant cells.

### Conclusion
After analyzing all the options, the incorrect statement is **Option C: All eukaryotic cells are identical.**

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