In the C and C++ programming languages, #pragma once is a non-standard but widely supported preprocessor directive designed to cause the current source file to be included only once in a single compilation.
Best Answer: In humans, you would find 23 chromosomes in a sperm cell; 23 chromosomes in an egg cell; and 46 chromosomes in a white blood cell. All human body cells contain 46 chromosomes (two sets of 23 chromosomes). Only the gametes (i.e., the sperm & eggs) contain 23 chromosomes (one set of 23 chromosomes) because two gametes combine to form a new person with 46 chromosomes in his body cells. Body cells grow and reproduce by the process of mitosis.
Ovum is simply the female gamete. Since the nucleus of this reproductive cell contains only a half number of chromosomes as a usual cell does have, an ovum is considered as a haploid cell. Ova (plural of ovum) are present in both animals and embryophytes. The female reproductive cell of the plants is called the gametophyte.