Centrioles are present in human sperm in:

The correct answer is Option (2) → Neck

A human sperm has four parts: a head, a neck, a middle piece and a tail. The head holds the haploid nucleus and the acrosome. The short neck joins the head to the middle piece. It contains the centrioles. The distal centriole forms the base of the tail filament, which moves the sperm.

(1) Acrosome — Incorrect. The acrosome is the cap-like structure on the front of the head. It is filled with enzymes that help the sperm to enter the ovum.

(2) Neck — Correct. The centrioles lie in the neck, between the head and the middle piece.

(3) Head — Incorrect. The head contains the elongated haploid nucleus and the acrosome, not the centrioles.

(4) Tail — Incorrect. The tail is the long part that beats to move the sperm. Its filament grows from a centriole in the neck, but the centrioles themselves are in the neck.