Explain the fate of inner cell mass in a human embryo immediately after implantation?

List the three hormones produced in women only during pregnancy. What happens to the levels of estrogen and progesterone during pregnancy?

What is the number of chromosomes in the following cells of a human male?
Spermatogonial cells.

Why does corpus luteum secrete large amount of progesterone during luteal/ secretory phase of the menstrual cycle?

Even before birth of the baby, the mother shares a beautiful bond with the child. Explain the statement in scientific manner.

Name the stage of the human embryo that gets implanted in the uterus and draw its labeled diagram.

Why are the human testes located outside the abdominal cavity? Name the pouch in which they are present.

Write the function of each of the following:
Middle piece in human sperm.

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

Draw and label the parts of the only head region of a human sperm.
OR
Draw a well-labelled diagram of a sperm.