A student was given a sample of tissue. He observes and concludes the following characters.
(i) The following The cells are composed of a single layer of tall and slender cells.
(ii) Their nuclei are located at the base.
(iii) Free surface may have microvilli .
(iv) It is found in the lining of stomach and intestines
(v) It help in secretion and absorption.
Based on the above features identify the epithelium.

Options

A. Cuboidal epithelium
B. Columnar epithelium
C. Squamous epithelium
D. Keratinized epithelium

Answer

To identify the type of epithelium based on the given characteristics, we can follow these steps:

### Step-by-Step Solution:

1. **Analyze the Cell Structure**: The first observation states that the cells are composed of a single layer of tall and slender cells. This description suggests that the cells are elongated, which is a characteristic of columnar epithelium.

**Hint**: Look for terms like "tall" and "slender" to identify the shape of the epithelial cells.

2. **Nucleus Position**: The second observation mentions that the nuclei are located at the base of the cells. In columnar epithelium, the nuclei are typically positioned towards the base, which supports the identification of this tissue type.

**Hint**: The location of the nucleus can help differentiate between types of epithelium, such as simple cuboidal or columnar.

3. **Surface Features**: The third observation indicates that the free surface may have microvilli. Microvilli are often present on the surface of columnar epithelial cells, especially in areas where absorption occurs, such as in the intestines.

**Hint**: Microvilli increase the surface area for absorption, which is a key feature of certain epithelial tissues.

4. **Location of Tissue**: The fourth observation states that this epithelium is found in the lining of the stomach and intestines. This is consistent with the function of columnar epithelium, which lines the gastrointestinal tract.

**Hint**: Knowing where the tissue is located can help confirm its type based on its function.

5. **Function of the Epithelium**: The final observation mentions that it helps in secretion and absorption. Columnar epithelium is specialized for these functions, particularly in the digestive system.

**Hint**: Consider the functions of the tissue when identifying its type; different epithelia serve different roles in the body.

### Conclusion:
Based on the observations, the epithelium described is **simple columnar epithelium**. More specifically, if microvilli are present, it can be referred to as **simple columnar epithelium with microvilli**, commonly found in the lining of the stomach and intestines, aiding in secretion and absorption.