Give reasons for the following:

1. The human testes are located outside the abdominal cavity.
2. Some organisms like honey-bees are called parthenogenetic animals.

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

Mention the target cells of luteinising hormone in human males and females. Explain the effect and the changes which the hormone induces in each case.

Draw a labelled diagram of a part of the transverse section through seminiferous tubule of human testis showing the various stages of spermatogenesis.

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

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

1. Where do the signals for parturition originate from in humans?
2. Why is it important to feed the newborn babies on colostrum?

A sperm has just fertilised a human egg in the fallopian tube. Trace the events that the fertilised egg will undergo up to the implantation of the blastocyst in the uterus.

How is the milk production regulated by hormones in human female? Explain.

How does the female gamete reach the uterus from ovary?