Simple cuboidal epithelium is not found in
Sweat gland
Choroid of eye
Thin bronchioles
Urethra
The cells of simple cuboidal epithelium are almost as tall as they are wide. They contain a single layer of cuboidal cells with large spherical nuclei that are centrally located. Their major functions are absorption and secretion. Moreover, their prominent thickness permits cytoplasm to be rich in mitochondria and also other organelles for a high degree of active transport across the epithelium and other functions. Examples – cells covering thyroid follicles, ovaries, etc.
The simple cuboidal epithelium also lines the pigment layer of the retina.Cuboidal epithelia form the lining of convoluted parts of uriniferous tubules in kidney, ciliary body, choroid of eyes, thin bronchioles and lining of some glands.
Option d is the correct answer.