State whether the following statement is true or false: The uterus opens into the vagina through the cervix.

Which of the following is a characteristic of asexual reproduction?

How does fertilization take place? Fertilization occurs once in a month. Comment.

In which type of reproduction do genetic variations occur in the offspring?

Which among the following is not the function of testes at puberty?
$(i)$ formation of germ cells
$(ii)$ secretion of testosterone
$(iii)$ development of placenta
$(iv)$ secretion of estrogen

Where are the testes located in human males?