Women experience two major events in their life time, one at menarche and the second at menopause. Mention the characteristics of both the events.

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

Where does the first cleavage division of zygote take place?

Differentiate between morula and blastula.

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

1. Spermatogonial cells.
2. Spermatids.
3. Primary spermatocytes.
4. Sertoli cells.

Answer the following questions:
Where do the signals for parturition originate from in humans?

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

What is seminal plasma? What are its components?

Draw a diagrammatic sketch of the microscopic view of a mammalian sperm and label any four parts in it.

Write the function of each one of the following:
Oxytocin.