Haploid nucleus is present in which part of the sperm?
Head
Neck
Middle piece
Tail
Sperm is composed of head , neck , middle piece and a tail.
Head contains an elongated haploid nucleus covered by acrosome.acrosome is filled with enzymes that help in fertilisation of ovum.
Middle piece bears mitochondria that produce energy for movement of tail and motility of the sperm.
Hence option A is correct.