Q18. Explain the structure of human sperm with a neat labelled diagram.
❖ A mature sperm composes of a head, neck, a middle piece and a tail.
❖ A plasma membrane envelops the whole body of sperm.
❖ The sperm head contains an elongated haploid nucleus and a cap-like structure, acrosome.
❖ The acrosome is filled with enzymes that help fertilisation of the ovum.
❖ The middle piece possesses numerous mitochondria, which produce energy for the movement of tail that facilitate sperm motility.
❖ Centriole present in the neck region helps in cleavage after fertilization.