Squamous epithelium is a type of tissue that is composed of flattened cells. These cells are thin and flat, resembling scales or plates. They are tightly packed together, forming a smooth and continuous layer. Squamous epithelium can be found in various parts of the body, including the skin, lining of blood vessels, and the respiratory and digestive tracts.

The correct answer to the question is option 'C', which states that the cells of squamous epithelium are flat plate-like in shape. This means that the cells are thin and wide, resembling plates or scales. Let's understand why this answer is correct and why the other options are incorrect.

- Columnar: Columnar epithelium is another type of tissue that is composed of tall, elongated cells. These cells are rectangular or column-shaped, and they are found in areas such as the lining of the intestines. This option is incorrect because columnar cells are not characteristic of squamous epithelium.

- Tall with elongated nuclei: This option describes the shape of columnar cells, not squamous cells. Squamous cells have flat nuclei, which are centrally located within the cell. The nuclei of columnar cells are typically elongated and located towards the base of the cell.

- Flat plate-like: This is the correct option, as it accurately describes the shape of squamous cells. These cells are flat and thin, resembling plates or scales. They are tightly packed together, forming a smooth and continuous layer.

- Cube-like: Cube-like cells are characteristic of cuboidal epithelium, another type of tissue. Cuboidal cells are cube-shaped and can be found in areas such as the lining of the kidney tubules. This option is incorrect because cuboidal cells are not characteristic of squamous epithelium.

In summary, the cells of squamous epithelium are flat and plate-like in shape. They are thin and wide, tightly packed together to form a smooth and continuous layer. This type of tissue can be found in various parts of the body and serves important functions such as protection and secretion.