Which of the following statements is/are incorrect about columnar epithelium?
(i) It is made of tall and slender cells.
(ii) Free surface may have microvilli.
(iii) They are found in stomach and intestine and help in secretion and absorption.
(iv) Ciliated epithelium is mainly present in hollow structures like bronchioles and Fallopian tubes.
(v) They have apical nuclei.

Options

A. Only (i)
B. Only (v)
C. (ii) and (iv)
D. (ii) and (iii)

Explanation

To determine which statements about columnar epithelium are incorrect, let's analyze each statement one by one:

1. **Statement (i)**: "It is made of tall and slender cells."
- **Analysis**: This statement is correct. Columnar epithelium consists of tall and slender (column-like) cells.

2. **Statement (ii)**: "Free surface may have microvilli."
- **Analysis**: This statement is also correct. The free surface of columnar epithelium can have microvilli, which increase the surface area for absorption.

3. **Statement (iii)**: "They are found in stomach and intestine and help in secretion and absorption."
- **Analysis**: This statement is correct. Columnar epithelium is indeed found in the stomach and intestines, where it plays a crucial role in secretion and absorption.

4. **Statement (iv)**: "Ciliated epithelium is mainly present in hollow structures like bronchioles and Fallopian tubes."
- **Analysis**: This statement is correct. Ciliated epithelium is found in structures such as bronchioles and Fallopian tubes, where it helps in the movement of substances.

5. **Statement (v)**: "They have apical nuclei."
- **Analysis**: This statement is incorrect. In columnar epithelium, the nuclei are typically located near the base of the cells, not at the apex.

Based on the analysis, the incorrect statement about columnar epithelium is:

- **Answer**: Statement (v) is incorrect.

### Summary of Incorrect Statements:
- Only statement (v) is incorrect.