How would a test confirm sexual intercourse by analysing vaginal swab?

Name the muscular and glandular layers of human uterus. Which one of these layers undergoes cyclic changes during menstrual cycle? Name the hormone essential for the maintenance of this layer.

After implantation interdigitation of maternal and foetal tissues takes place. Identify the tissues involved and justify their role.

Study the sectional view of human testis showing seminiferous tubules given below. Answer the questions that follow.
Write the functions of a and d.

The doctor could hear the heartbeats in a foetus. How many days of gestation period must have passed?

Write the location and functions of the following in human testes:
Sertoli cells.

What are the events taking place in the ovary and uterus during follicular phase of the menstrual cycle?

Write two major functions each of testis and ovary.

Explain the events that follow up to fertilization when the sperms come in contact with the ovum in the fallopian tube of a human female.

Study the figure given below and answer the questions that follow:
Name the stage of human embryo the figure represents.