The correct option is D Sperm
Human
male germ cell is sperm. Each sperm is a single cell. During the last step of
spermatogenesis, spermatids are transformed into spermatozoa by the process of
metamorphosis. These spermatozoa are known as sperms. Mature sperm consists of
a head, a neck, a middle piece and a tail. A plasma membrane envelops the whole
body of sperm. The sperm head contains a very little cytoplasm, an elongated
haploid nucleus, the anterior portion of which is covered by a cap-like
structure, acrosome. Sperm fertilizes with ovum and leads to the formation of
zygote.