Answer: Option C. -> Progesterone
:
C
The major events in menstrual cycle include menstruation, the follicular phase and the luteal phase, after which the next cycle begins.Both LH and FSH attain a peak level in the middle of the cycle (about the 14th day). Rapid secretion of LH leading to its maximum level during the mid-cycle, called LH surge, induces rupture of Graafian follicle and thereby the release of ovum (ovulation). The ovulation (ovulatory phase) is followed by the luteal phase during which the remaining parts of the Graafian follicle transform as the corpus luteum. The corpus luteum secretes large amounts of progesterone which is essential for maintenance of the endometrium. Such an endometrium is necessary for implantation of the fertilised ovum and other events of pregnancy.

Answer: Option C. -> Ciliated epithelium in the fallopian tube
:
C
Simple cuboidal epithelial tissue consists of a single layer ofcuboidalcells on the basement membrane. At some places the cuboidal epithelium is ciliated, like in the fallopian tubes. The beating movement of the cila helps in moving the ovum from the fallopian tube down the reproductive tract.

Answer: Option B. -> Fallopian tube
:
B
Anectopic pregnancyoccurs when a fertilised egg does not implant andgrowin the uterus as usual, but instead, implants and begins togrowelsewhere, usually in the fallopian tube.

Answer: Option D. -> All of the above.
:
D
Endometriosisis a disease in which tissue that normally grows inside the uterus (endometrium) grows outside it. Most often this is on the ovaries, fallopian tubes, and tissue around the uterus and ovaries; however, in rare cases, it may also occur in other parts of the body.

Answer: Option C. -> P - iv                   Q - iii                  R - ii                 S - i
:
C
The sperm is divisibleinto 3 parts - the head, midpiece and tail. The head consists of acrosome which contains hyaluronidase and proteolytic enzymes, which help in penetrating the ovum during fertilisation. Along with the acrosome the head of the sperm also consists of a haploid nucleus and centrioles. The midpiece of the sperm has mitochondria which producethe energy necessary for sperm motility. The tail is mainly involved in providing motility to the spermatozoon, and propels it forward.

Answer: Option A. -> Cervix        
:
A
The uterus is also called the womb.Thecervixis the lower part of the uterus that connects the uterus to the vagina. The function of the cervix is to allow the flow of menstrual blood from theuterusinto thevagina. It also aids in carrying sperm from the vagina to the uterus. It also widens during childbirth to allow the passage of the baby.

Answer: Option C. -> mitochondria and 9 + 2 arrangement of microtubules
:
C
A sperm is a microscopic structure composed of a head, neck, a middle piece and a tail. A cross section at the midpoint of the middle piece of a sperm will show mitochondria and 9 + 2 arrangement of microtubules.The middle piece possesses numerous mitochondria, which produce energy for the movement of the tail that facilitates sperm motility essential for fertilisation.