A diagrammatic sketch of the human male reproductive system is given above.
(a) Identify and name the three glands associated with the human male reproductive system. What is the term given to their secretions?
(b) Name the primary sex organ and the pouch in which it is located in human beings.

A Human Spermatozoan
A diagrammatic sketch of a human sperm is given. Identify the parts labelled A, Band C and mention their respective functions.

Study the following flow chart and answer the questions that follow:

With reference to the above schematic diagram of (a) Spermatogenesis and (b) Oogenesis, answer the following questions.
(a) About 300 million spermatozoa may be present in a human male ejaculate at one time. Calculate how many primary spermatocytes will be involved to produce this number of spermatozoa .
(b) How many spermatids will be formed?
(c) How many chromatids are found during Oogenesis in
(i) Primary oocyte and
(ii) First polar body in a human female?

(A) In the diagrammatic sectional view of a human ovary, identify the following:
(i) Corpus luteum
(ii) Antrum
(iii) Secondary oocyte
(iv) Primary follicle
(B) Name the hormone that
(i) influences the formation of corpus luteum.
(ii) is secreted by corpus luteum.

The events in a menstrual cycle are represented above. Answer the following questions based on that.
(a) Why is the phase between 5^th and 15^th day of menstrual cycle, called
(i) proliferative phase?
(ii) follicular phase?
(b) Mention the ovarian events during the luteal phase.

Read the graph given above and answer the following questions:
(a) Identify the ovarian hormones X and Y and name their respective sources in the ovary.
(b) Why does the hormone X peak before the hormone Y?

(a) Identify the pituitary hormones 'X' and 'Y' shown in the graph.
(b) Mention two functions each of X and Y in human females.

Study the flow chart given below and answer the questions that follow:

(a) Name the hormone(s) (in full form) involved in each of the stages, 
(b) Specify the structure in the ovary that is the source of the hormone at stage 

(a) Identify the human embryonic stages, A and B given.
(b) Write two differences between A and B.

(a) Name the human embryonic stage shown above.
(b) Identify 'a' and 'b' in it.
(c) Where are stem cells located in it?
(d) Mention the role of 'b'.

Three of the steps in the neuro-endocrine mechanism of parturition are mentioned below. Write the other missing steps.
(a) Signals for parturition originate from the fullydeveloped foetus and placenta.
(b) _________________.
(c) _________________.
(d) Oxytocin causes stronger uterine contractions, which stimulate further secretion of oxytocin.
(e) __________________.
(f) ________________.

Read the following and answer any four questions from (i) to (v) given below:
Human male reproductive system comprises of a pair of testes, primary sex organs associated with formation of gametes and production of sex hormone. Study the given figure of human male reproductive system and answer the following questions.

(i) Which of the following is correct for labelled part P?

(ii) Identify the correctly matched pair.

(iii) Which statement is incorrect for Q?

(iv) Which structure passes through the prostate gland and carries sperms and secretion of seminal vesicle?

(v) Assertion: Mucus present in secretion of bulbourethral gland decreases the number of sperms damaged during ejaculation
Reason: Mucus lubricates the end of penis and lining of the urethra.
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Both assertion and reason are false .

Read the following and answer any four questions from (i) to (v) given below:
Oogenesis is the process of formation of ovum in ovaries. It consists of three phases : multiplication, growth and maturation. Oogenesis is controlled by hormones GnRH, LH, FSH. GnRH secreted by the hypothalamus stimulates the anterior lobe of pituitary gland to secrete LH and FSH.
(i) What is the function of hormone FSH?

(ii) Which hormone induces the rupture of the mature Graafian follicle?

(iii) Which cell division is involved in the formation of secondary oocyte?

(iv) Identify the function(s) of LH.
(A) Release of secondary oocyte from Graafian follicle.
(B) Stimulates corpus luteum to secrete progesterone.
(C) Stimulates estrogen formation.
(D) Promotes development of egg to form secondary oocyte.

(v) Assertion: The increase in progesterone level exerts positive feedback on GnRH
Reason: The rising level of progesterone stimulate production of FSH and LH.
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Both assertion and reason are false.

Read the following and answer any four questions from (i) to (v) given below:
The first menstruation is called menarche, that usually occurs between 12 and 15 years. In human females, menstruation is repeated at an average interval of about 28129 days and is called menstrual cycle. It is regulated by certain hormones, as pituitary gland is stimulated by releasing factors produced in the hypothalamus. The hormones produced by pituitary gland influence the ovaries. The hormones secreted by the ovaries affect the walls of the uterus.
(i) The breakdown of endometrium is characteristic of

(ii) Which days of the menstrual cycle marks the proliferative phase?

(iii) Which of the following occurs during secretory phase?

(iv) Identify the hormones that attain peak level during ovulatory phase

(v) Withdrawal of which hormone causes degeneration of corpus luteum?