The spherical bacteria of the species $Neisseria$ $gonorrhoeae$ are responsible for which sexually transmitted disease in humans?

List six specific characteristics of sexual reproduction.

$(a)$ Name the human male reproductive organ that produces sperms and also secretes a hormone. Write the functions of the secreted hormone.
$(b)$ Name the parts of the human female reproductive system where:
$(i)$ fertilisation takes place.
$(ii)$ implantation of the fertilised egg occurs. Explain how the embryo gets nourishment inside the mother's body?

Name the type of cells which undergo regeneration.

State one function each performed by the following organs in human beings:
$(a)$ Testes
$(b)$ Prostate gland

During adolescence,several changes occur in the human body. Mark one change associated with sexual maturation in boys: