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?

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 .

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 

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