Write true or false for the statement: The development of the child inside the mother's body takes approximately eleven months.

Which is the primary sex organ of the male reproductive system?

For approximately how many days does menstruation last in human females?

In human females,where does the implantation and development of the embryo occur?

$(i)$ $(a)$ Write the full form of $DNA$.
$(b)$ State the role of $DNA$ in the cell nucleus.
$(c)$ What will be the after-effect if the information of the $DNA$ is changed?
$(ii)$ Explain the importance of $DNA$ copying in reproduction.

In human males,the testes lie in the scrotum,because it helps in the