In mammalian sperm,spirally arranged mitochondria are present in

How many structures in the list given below are haploid? Spermatid,secondary oocyte,primary spermatocyte,ovum,sperm,oogonia,spermatogonia,polar body.

Which of the following secretes progesterone?

Given below are two statements:
$Statement-I$: At the onset of puberty, the pituitary gland begins secretion of gonadotropin releasing hormone.
$Statement-II$: $GnRH$ initiates the significant increase in the secretion of follicle stimulating hormone $(FSH)$ which induces gametogenesis.
In light of above statements, choose the correct appropriate answer from the options given below.

What does the head of a mature mammalian sperm consist of?

What is the number of chromosomes in a human sperm?