Read the following statements regarding the ciliated epithelium .
I. Found only in the lining of the trachea .
II cilia are found on the free surface of the cells.
III Help in moving particles or mucus in a particular direction over the epithelium.
IV Microvilli are found at the free end to increase the surface area of the organ.
identify the ones that are correct .

Options

A. I, II , III and IV
B. I and II only
C. II and III only
D. II , III and IV only

Answer

To solve the question regarding the statements about ciliated epithelium, we will analyze each statement one by one.

### Step 1: Analyze Statement I
**Statement I:** "Found only in the lining of the trachea."
- **Analysis:** This statement is incorrect. Ciliated epithelium is not exclusive to the trachea; it is also found in other locations such as the fallopian tubes, the uterus, and parts of the respiratory tract. Therefore, this statement is false.

### Step 2: Analyze Statement II
**Statement II:** "Cilia are found on the free surface of the cells."
- **Analysis:** This statement is correct. Ciliated epithelium is characterized by the presence of cilia on the free surface of the epithelial cells, which play a crucial role in moving substances across the epithelial surface.

### Step 3: Analyze Statement III
**Statement III:** "Help in moving particles or mucus in a particular direction over the epithelium."
- **Analysis:** This statement is also correct. The primary function of cilia is to facilitate the movement of mucus and particles in a specific direction, which is essential for clearing debris and pathogens from the respiratory tract.

### Step 4: Analyze Statement IV
**Statement IV:** "Microvilli are found at the free end to increase the surface area of the organ."
- **Analysis:** This statement is incorrect in the context of ciliated epithelium. Microvilli are not a characteristic feature of ciliated epithelium; they are typically found in absorptive tissues, such as in the intestines, to increase surface area for absorption. Ciliated epithelium primarily has cilia, not microvilli.

### Conclusion
Based on the analysis:
- **Correct Statements:** II and III
- **Incorrect Statements:** I and IV

### Final Answer
The correct statements regarding ciliated epithelium are II and III.

---