The figure given ahead is an organ system of humans. Study the same and answer the following questions.

(a) Identify the organ system.

(b) Label the guidelines 1 to 7.

(c) Write one important role of parts 3 and 6.

(d) Name the cells of part 1 that produce testosterone.

(e) What is the significance of the part 1 being located in a separate sac suspended outside the body ?

The diagram below is that of a developing human foetus in the womb. Study the same and answer the questions that follow:

(a) Name the parts '1' to '5' indicated by guidelines.

(b) What term is given to the period of development of the foetus in the womb?

(c) How many days does the foetus take to be fully developed?

(d) Mention two functions of the parts labelled '2' other than its endocrine functions.

(e) Name any one hormone produced by the part labelled '2'.

The figure given below is the human female reproductive system. Study the same and answer the following questions.

(a) Label the guidelines 1 to 6 shown in the figure.

(b) What is the normal gestation period in human ?

(c) Where are the sperms released during coitus ?

(d) Write two important functions of part 2.

(e) Mention the technical term for the fixing of developing zygote to the uterine wall.

The figure given below is an important gonad of humans. Study the figure and answer the following questions.

(a) Identify the organ. Write its specific location in the body.

(b) Label the parts shown in the figure as 1 to 4.

(c) Write important functions of parts 2 and 4.

(d) Name one cellular structure and one hormone which are produced in part 3.

(e) Draw a neat and labelled diagram of the cellular structure mentioned by you in (d).