12th Class Biology Human Reproduction Question Bank

done Case Based (MCQs) - Human Reproduction Total Questions - 55

• question_answer1)

  Directions : (1 - 5)

  Read the passage given below and answer the following questions.

  The testes are primary sex organ and situated outside the abdominal cavity within a pouch called scrotum. The scrotum helps in maintaining the low temperature of the testes, i.e. \[2-2.5\text{ }{}^\circ C\] lower than the normal internal body temperature necessary for spermatogenesis, i.e. sperm formation. In adults, each testis is oval in shape, with a length of about 4 to 5 cm and a width of about 2 to 3 cm. The testis is covered by a dense covering. Each testis has about 250 compartments called testicular lobules. Each lobule contains one to three highly coiled seminiferous tubules in which sperms are produced. Each seminiferous tubule is lined on its inside by two types A cells called male germ cells or spermatogonia and Sertoli cells of columnar shape. The male germ cells are cuboidal in shape and undergo meiotic divisions finally leading to sperm formation, while Sertoli cells provide nutrition to the germ cells. The regions outside the seminiferous tubules called interstitial spaces, contain small blood vessels and interstitial cells or Ley dig cells. Leydig cells synthesise and secrete testicular hormones called androgens, e.g. testosterone. Other immunologically competent cells are also present.

  The human testes are
  A)
  Primary sex organ done clear
  B)
  Secondary sex organ done clear
  C)
  Tertiary sex organ done clear
  D)
  Accessory sex organ done clear
  View Solution play_arrow

• question_answer2)
  The scrotum in human being helps in maintaining the low temperature of the testis between
  A)
  5 to \[5.5{}^\circ C\] lower than body temperature done clear
  B)
  4 to \[4.5{}^\circ C\] lower than body temperature done clear
  C)
  3 to \[3.5{}^\circ C\] lower than body temperature done clear
  D)
  2 to \[2.5{}^\circ C\] lower than body temperature done clear
  View Solution play_arrow

• question_answer3)
  Each lobule of testis contains how many seminiferous tubules?
  A)
  One to three highly coiled done clear
  B)
  Two to four highly coiled done clear
  C)
  Three to six highly coiled done clear
  D)
  Four to eight highly coiled done clear
  View Solution play_arrow

• question_answer4)
  Shape of the Sertoli cell is
  A)
  Cuboidal done clear
  B)
  Columnar done clear
  C)
  Squamous done clear
  D)
  Collenchymatous done clear
  View Solution play_arrow

• question_answer5)
  Ley dig cells or interstial cells secrete which type of hormone?
  A)
  Estrogen done clear
  B)
  Progesterone done clear
  C)
  Androgens done clear
  D)
  Relaxin done clear
  View Solution play_arrow

• question_answer6)

  Directions (6 - 10)

  Read the passage given below and answer the following questions.

  These are the primary female sex organs that produce the female gamete, i.e. ovum and several steroid hormones, i.e. ovarian hormones. The ovaries are located one on each side of the lower abdomen i.e. upper pelvic cavity. Each ovary is unshelled almond shape and about 2 to 4 cm in length and is connected to the pelvic wall and uterus by ligaments, i.e. ovarian ligament. The broad ligament of the uterus is also attached to the ovary by double fold of peritoneum called mesovarium. Each ovary is covered by a thin epithelium which encloses the ovarian stroma. The stroma is divided into two zones - a peripheral cortex and an inner medulla.

  Ovary in female human beings is :
  A)
  Primary sex organ done clear
  B)
  Secondary sex organ done clear
  C)
  Tertiary sex organ done clear
  D)
  Accessory sex organ done clear
  View Solution play_arrow

• question_answer7)
  Ovary secretes which type of steroid hormones?
  A)
  Estrogen done clear
  B)
  Progesterone done clear
  C)
  Relaxin done clear
  D)
  [a] and [b] done clear
  View Solution play_arrow

• question_answer8)
  Mesovarium of the ovary is
  A)
  Single fold of peritoneum done clear
  B)
  Double fold of peritoneum done clear
  C)
  Triple fold of peritoneum done clear
  D)
  Tetra fold of peritoneum done clear
  View Solution play_arrow

• question_answer9)
  Ovary of female is
  A)
  Unshelled and pear shaped done clear
  B)
  Shelled and pear shaped done clear
  C)
  Unshelled and almond shaped done clear
  D)
  Shelled and almond shaped done clear
  View Solution play_arrow

• question_answer10)

  Assertion: Ovary is a primary sex organ.

  Reason: It never helps in the secretion of sex hormones.

  A)
  Assertion and reason both are correct statements and reason is the correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not the correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
  View Solution play_arrow

• question_answer11)

  Directions : (11 - 15)

  Read the passage given below and answer the following questions.

  The uterus is single, hollow and muscular. The shape of the uterus is like an inverted pear. It is supported by ligaments attached to the pelvic wall. Uterus is composed of four parts :

  i. Fundus : Upper dome shaped part of the uterus slightly above the openings of fallopian tubes.

  ii. Cornua (Sing. Cornu) : They are the upper corners where the oviducts enter the uterus.

  iii. Body or Corpus : It is the main part of the uterus.

  iv. Cervix : The uterus opens into vagina through a narrow cervix. The cavity of the cervix is called cervical canal which along with vagina forms the birth canal. The cervix communicates above with the body of uterus by an aperture called internal OS and with the vagina by an opening the external OS. The wall of the uterus has three layers of tissue. The external thin membranous perimetrium, the middle thick layer of smooth muscle, myometrium, and the inner glandular layer with blood vessels called endometrium that lines the uterine cavity. The endometrium undergoes cyclical changes during menstrual cycle while the myometrium exhibits strong contraction during delivery of the baby.

  Shape of the uterus in female human beings is
  A)
  Upright pear done clear
  B)
  Inverted pear done clear
  C)
  Upright almond done clear
  D)
  Inverted almond done clear
  View Solution play_arrow

• question_answer12)
  The external covering of uterus is
  A)
  Myometrium done clear
  B)
  Endometrium done clear
  C)
  Perimetrium done clear
  D)
  Mesovarium done clear
  View Solution play_arrow

• question_answer13)
  Birth canal is
  A)
  Fundus and Cornu done clear
  B)
  Corpus and Cervix done clear
  C)
  Fundus and Cervix done clear
  D)
  Cervical canal and Vagina done clear
  View Solution play_arrow

• question_answer14)
  Which layer of uterus undergoes cyclical changes during menstrual cycle?
  A)
  Endometrium done clear
  B)
  Perimetrium done clear
  C)
  Myometrium done clear
  D)
  Mesorchium done clear
  View Solution play_arrow

• question_answer15)

  Assertion: Myometrium of uterus is composed of smooth muscles.

  Reason: Endometrium is glandular and inner layer of uterus.

  A)
  Assertion and reason both are correct statements and reason is the correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not the correct explanation for assertion. done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
  View Solution play_arrow

• question_answer16)

  Directions : (16 - 20)

  Read the passage given below and answer the following questions.

  In testis, the immature male germ cells i.e., spermatogonia produce sperms by spermatogenesis that begins at puberty (13 to 16 years). Testosterone plays a significant role in puberty. The spermatogonia (sing. spermatogonium) present on the inside wall of seminiferous tubules multiply by mitotic division and increase in numbers. Each spermatogonium is diploid and contains 46 chromosomes. Some of the spermatogonia called primary spermatocytes periodically undergo meiosis. A primary spermatocyte completes the first meiotic division, i.e. reduction division leading to formation of two equal, haploid cells called secondary spermatocytes, which have only one set of chromosomes each. The secondary spermatocytes undergo the second meiotic division to produce four equal, haploid spermatids. The spermatids are transformed into spermatozoa or sperms by the process called spermiogenesis. After spermiogenesis, sperm heads become embedded in the Sertoli cells, and are finally released from the seminiferous tubules by the process called spermiation. Spermatogenesis starts at the age of puberty due to significant increase in the secretion of gonadotropin releasing hormone GnRH). It is a hypothalamic hormone. The increased levels of GnRH then acts at the anterior pituitary gland and stimulates secretion of two gonadotropins hormones: LH (Leuteinising Hormone) ; It acts at the Leydig cells and stimulates synthesis and secretion of androgens. Androgens, in turn, stimulate the process of spermatogenesis. FSH (Follicle Stimulating Hormone) : It acts on the Sertoli cells and stimulates secretion of Androgen binding factors (ABP) which help in the process of spermiogenesis.

  Spermatogenesis in human beings begins at the age of
  A)
  10 to 13 years done clear
  B)
  13 to 16 years done clear
  C)
  16 to 19 years done clear
  D)
  19 to 21 years done clear
  View Solution play_arrow

• question_answer17)
  Spermatogonium present on the inside wall of seminiferous tubules multiples by
  A)
  Amitotic cell division done clear
  B)
  Mitotic cell division done clear
  C)
  Meiotic cell division done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer18)
  Ploidy level of spermatogonium is
  A)
  Haploid done clear
  B)
  Diploid done clear
  C)
  Triploid done clear
  D)
  Polyploid done clear
  View Solution play_arrow

• question_answer19)
  Primary spermatocytes periodically undergo
  A)
  Amitosis done clear
  B)
  Mitosis done clear
  C)
  Meiosis done clear
  D)
  Dinomitosis done clear
  View Solution play_arrow

• question_answer20)
  Number of chromosomes in spermatid of human being is
  A)
  22 XX done clear
  B)
  22 XY done clear
  C)
  22 X or Y done clear
  D)
  44 XY done clear
  View Solution play_arrow

• question_answer21)

  Directions : (21 - 25)

  Read the passage given below and answer the following questions.

  The process of formation of a mature female gamete is called oogenesis which is markedly different from spermatogenesis. Oogenesis is initiated during the embryonic development stage when a couple of million gamete mother cells or oogonia are formed within each foetal ovary; no more oogonia are formed and added after birth. These cells start division and enter into prophase-I of the meiotic division and get temporarily arrested at that stage, called primary oocytes. Each primary oocyte then gets surrounded by a layer of granulosa cells and then called the primary follicle. A large number of these follicles degenerate, i.e. follicular atresia, and such follicles are called atretic follicles during the phase from birth to puberty. Therefore, at puberty only 60,000- 80,000 primary follicles are left in each ovary. The primary follicles get surrounded by more layers of granulosa cells and a new theca and called secondary follicles. The secondary follicle soon transforms into a tertiary follicle which is characterised by a fluid filled cavity called antrum or liquor folliculi. The theca layer is organised into an inner theca interna and an outer theca externa. A solid mass of follicular cells that surrounds the developing ovarian follicle is called cumulus oophorus or ovaricus formed by granulosa cells.

  Cumulus oophorus is formed of
  A)
  Interstial cells done clear
  B)
  Follicular cells done clear
  C)
  Granulosa cells done clear
  D)
  Germ cells done clear
  View Solution play_arrow

• question_answer22)
  Ploidy level of secondary oocytes is
  A)
  Haploid (n) done clear
  B)
  Diploid (2n) done clear
  C)
  Triploid (3n) done clear
  D)
  Tetraploid (4n) done clear
  View Solution play_arrow

• question_answer23)
  Chromosomal set up in the polar body or polocyte is
  A)
  44 X done clear
  B)
  22 X done clear
  C)
  44X done clear
  D)
  22 XX done clear
  View Solution play_arrow

• question_answer24)
  First meiotic division during oogenesis is recorded in which stage
  A)
  Oogonia done clear
  B)
  Primary ooeyte done clear
  C)
  Secondary oocyte done clear
  D)
  Ootid done clear
  View Solution play_arrow

• question_answer25)

  Assertion: Corpus luteum secretes progesterone, estrogen and relaxin hormones.

  Reason: Ploidy level of the polocyte is diploid.

  A)
  Assertion and reason both are correct statements and reason is the correct explanation for assertion. done clear
  B)
  Assertion and reason both are correct statements but reason is not the correct explanation for assertion done clear
  C)
  Assertion is correct statement but reason is wrong statement. done clear
  D)
  Assertion is wrong statement but reason is correct statement. done clear
  View Solution play_arrow

• question_answer26)

  Directions : (26 - 30)

  Read the passage given below and answer the following questions.

  The testes are primary sex organ and situated outside the abdominal cavity within a pouch called scrotum. It helps in maintaining the low temperature of the testes, i.e. 2 to \[2.5\text{ }{}^\circ C\] lower than the normal internal bod temperature necessary for spermatogenesis, i.e. sperm formation. In adults, each testis is oval in shape, with a length of about 4 to 5 cm and a width of about 2 to 3 cm. The testis is covered by a dense covering. Each testis has about 250 compartments called testicular lobules. The male germ cells are cuboidal in shape and undergo meiotic divisions finally leading to sperm formation, while Sertoli cells provide nutrition to the germ cells. The regions outside the seminiferous tubules called interstitial spaces, contain small blood vessels and Leydig cell. Leydig cells synthesise and secrete testicular hormones called androgens e.g., testosterone.

  Why are testes in human being primary sex organs?
  A)
  They secrete sperms. done clear
  B)
  They secrete testosterone hormone. done clear
  C)
  They secrete enzymes. done clear
  D)
  Both [a] and [b] done clear
  View Solution play_arrow

• question_answer27)
  Shape of the each testis in human being is :
  A)
  Flat done clear
  B)
  Oval done clear
  C)
  Columnar done clear
  D)
  Elongated done clear
  View Solution play_arrow

• question_answer28)
  Each testis in human being has how many lobules?
  A)
  Three testicular lobules done clear
  B)
  Fifty testicular lobules done clear
  C)
  Hundred testicular lobules done clear
  D)
  Two hundred fifty lobules done clear
  View Solution play_arrow

• question_answer29)
  Each testicular lobules in the testis of Homo sapiens has :
  A)
  One to fifty semniferous tubules done clear
  B)
  One to forty semniferous tubules done clear
  C)
  One to twenty semniferous tubules done clear
  D)
  One to three semniferous tubules done clear
  View Solution play_arrow

• question_answer30)
  Shape of the germ cells and Sertoli cells in semniferous tubule is :
  A)
  Cuboidal and cuboidal respectively done clear
  B)
  Cuboidal and columnar respectively done clear
  C)
  Squamous and columnar respectively done clear
  D)
  Squamous and squamous respectively done clear
  View Solution play_arrow

• question_answer31)

  Directions : (31 - 35)

  Read the passage given below and answer the following questions.

  Uterus opens into vagina also called birth canal. Opening of urinary bladder by urethra and female genital pore are separate in females. Space between vaginal wall and cervix is fornix. Vagina is lined by non-keratinised stratified squamous epithelium. Vagina opens to the outside by vaginal orifice or aperture which is partially covered by a membrane called hymen for releasing fluid. The hymen is often torn during the first coitus or intercourse. However, it can also be broken by a sudden fall or jolt, insertion of a vaginal tampon, active participation in some sports like horseback riding, cycling, etc. In some women the hymen persists even after coitus. In fact, the presence or absence of hymen is not a reliable indicator of virginity or sexual experience.

  Fornix in the female reproductive system is :
  A)
  Space between ovary and cervix done clear
  B)
  Space between uterus and cervix done clear
  C)
  Space between oviduct and cervix done clear
  D)
  Space between vaginal wall and cervix done clear
  View Solution play_arrow

• question_answer32)
  Vagina is lined by which type of epithelium -
  A)
  Keratinised stratified squamous epithelium done clear
  B)
  Non-Keratinised stratified squamous epithelium done clear
  C)
  Keratinised stratified cuboidal epithelium done clear
  D)
  Keratinised stratified columnar epithelium done clear
  View Solution play_arrow

• question_answer33)
  Partial covering of vaginal orifice or aperture in female is :
  A)
  Ostium done clear
  B)
  Hymen done clear
  C)
  Rughae done clear
  D)
  Fimbriae done clear
  View Solution play_arrow

• question_answer34)
  Vagina in female human beings is
  A)
  Seat to receive zygote done clear
  B)
  Seat to receive blastula done clear
  C)
  Seat to receive penis done clear
  D)
  Seat to receive gastrula done clear
  View Solution play_arrow

• question_answer35)
  The hymen in female gets torn during which of the following activities
  A)
  First intercourse or coitus done clear
  B)
  Sudden fall or jolt done clear
  C)
  Insertion of a vaginal tampon done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer36)

  Directions : (36 - 40)

  Read the passage given below and answer the following questions.

  In testis, spermatogonia produce sperms by spermatogenesis that begins at puberty. Testosterone plays a significant role in puberty. The spermatogonia present on the inside wall of seminiferous tubules multiply by mitotic division and increase in numbers. Each spermatogonium is diploid and contains 46 chromosomes. Some of the spermatogonia called primary spermatocytes periodically undergo meiosis. A primary spermatocyte completes the first meiotic division, i.e. reduction division leading to formation of two equal, haploid cells called secondary spermatocytes, which have only one set of chromosomes each. The secondary spermatocytes undergo the second meiotic division to produce four equal, haploid spermatids. The spermatids are transformed into spermatozoa or sperms by the process called spermiogenesis. After spermiogenesis, sperm heads become embedded in the Sertoli cells, and are finally released from the seminiferous tubules by the process called spermiation. Spermatogenesis starts at the age of puberty due to significant increase in the secretion of gonadotropin releasing hormone (GnRH). It is a hypothalamic hormone. The increased levels of GnRH then acts at the anterior pituitary gland and stimulates secretion of two gonadotropins hormones like Leuteinising Hormone and Follicle Stimulating Hormone.

  Seat of Spermatogenesis in male human is
  A)
  Senoli cells of seminiferous tubules done clear
  B)
  Nurse cells of seminiferous tubules done clear
  C)
  Sustentacular cells of seminiferous tubules done clear
  D)
  Germ cells of seminiferous tubules done clear
  View Solution play_arrow

• question_answer37)
  Ploidy level of the human primary spermatocytes is
  A)
  Haploid in nature done clear
  B)
  Diploid in nature done clear
  C)
  Triploid in nature done clear
  D)
  Tetraploid in nature done clear
  View Solution play_arrow

• question_answer38)
  Number of chromosomes i.e., autosomes as well as allosomes in spermatogonium
  A)
  24 chromosomes done clear
  B)
  48 chromosomes done clear
  C)
  46 chromosomes done clear
  D)
  23 chromosomes done clear
  View Solution play_arrow

• question_answer39)
  One primary spermatocytes by meiosis produce how many haploid spermatids during Spermatogenesis?
  A)
  One only done clear
  B)
  Two only done clear
  C)
  Three only done clear
  D)
  Four only done clear
  View Solution play_arrow

• question_answer40)
  Primary spermatocytes of human being is undergo which type of cell division
  A)
  Amitosis only done clear
  B)
  Amitosis and mitosis only done clear
  C)
  Amitosis and meiosis only done clear
  D)
  Meiosis only done clear
  View Solution play_arrow

• question_answer41)

  Directions : (41 - 45)

  Read the passage given below and answer the following questions.

  The testes are situated outside the abdominal cavity within a pouch called scrotum. The scrotum helps in maintaining the low temperature of the testes, i.e. \[2-2.5{}^\circ C\] lower than the normal internal body temperature necessary for Spermatogenesis, i.e. sperm formation. In adults, each testis is oval in shape, with a length of about 4 to 5 cm and a width of about 2 to 3 cm. The testis is covered by a dense covering. Each testis has about 250 compartments called testicular lobules. Each lobule contains one to three highly coiled seminiferous tubules in which sperms are produced. Each seminiferous tubule is lined on its inside by two types of cells called male germ cells and Sertoli cells of columnar shape. The male germ cells are cuboidal in shape and undergo meiotic divisions finally leading to sperm formation, while Sertoli cells provide nutrition to the germ cells. The regions outside the seminiferous tubules called interstitial spaces, contain small blood vessels and interstitial cells or Ley dig cells. Leydig cells synthesise and secrete testicular hormones called androgens e.g., testosterone. Other immunologically competent cells are also present.

  Cells of Leydig are found in which of the following?
  A)
  Kidney of rabbit done clear
  B)
  Kidney of frog done clear
  C)
  Testis of frog done clear
  D)
  Testis of man done clear
  View Solution play_arrow

• question_answer42)
  Senoli cells or nurse cells are involved in :
  A)
  Nutrition of sperms done clear
  B)
  Excretion of sperms done clear
  C)
  Respiration of sperms done clear
  D)
  Motility of sperms done clear
  View Solution play_arrow

• question_answer43)
  In cryptorchidism :
  A)
  Spermatogenesis fails to occur done clear
  B)
  Maturation of sperms does not occur done clear
  C)
  Testis fails 10 descend in scrotum done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer44)
  Testosterone hormone is secreted by which of the following cells?
  A)
  Mast cells done clear
  B)
  Sertoli cells done clear
  C)
  Kupffer cells done clear
  D)
  Leydig's cells done clear
  View Solution play_arrow

• question_answer45)
  Testes descent into scrotum in mammals for :
  A)
  Spermatogenesis done clear
  B)
  Development of sex organs done clear
  C)
  Fertilization done clear
  D)
  Development of visceral organs done clear
  View Solution play_arrow

• question_answer46)

  Directions : (46 - 50)

  Read the passage given below and answer the following questions.

  In testis, the immature male germ cells, i.e. spermatogonia produce sperms by spermatogenesis that begins at puberty. Testosterone plays a significant role in puberty. The spermatogonia present on the inside wall of seminiferous tubules multiply by mitotic division and increase in numbers. Each spermatogonium is diploid and contains 46 chromosomes. Some of the spermatogonia called primary spermatocytes periodially undergo meiosis. A primary spermatocyte completes the first meiotic division, i.e. reduction division leading to formation of two equal, haploid cells called secondary spermatocytes, which have only one set of chromosomes each. The secondary spermatocytes undergo the second meiotic division to produce four equal, haploid spermatids. The spermatids are transformed into spermatozoa or sperms by the process called spermiogenesis. After spermiogenesis, sperm heads become embedded in the Sertoli cells, and are finally released from the seminiferous tubules by the process called spermiation. Spermatogenesis starts at the age of puberty due to significant increase in the secretion of gonadotropin releasing hormone (GnRH). It is a hypothalamic hormone. The increased levels of GnRH then act at the anterior pituitary gland and stimulate secretion of two gonadotropins hormones: LH (Leuteinising Hormone): It acts at the Leydig cells and stimulates synthesis and secretion of androgens. Androgens, in turn, stimulate the process of Spermatogenesis. FSH (Follicle Stimulating Hormone) : It acts on the Sertoli cells and stimulates secretion of Androgen binding factors (ABP) which help in the process of spermiogenesis.

  How many sperms would be produced from 100 secondary spermatocytes during gametogenesis in humans?
  A)
  100 sperms done clear
  B)
  200 sperms done clear
  C)
  400 sperms done clear
  D)
  300 sperms done clear
  View Solution play_arrow

• question_answer47)
  In the male human beings, sperms contain autosomes and :
  A)
  Only one Y-chromosome done clear
  B)
  Only one X-chromosome done clear
  C)
  Both X and Y-chromosome done clear
  D)
  Either X or Y-chromosome done clear
  View Solution play_arrow

• question_answer48)
  Ploidy level of Spermatid in human beings is :
  A)
  4n done clear
  B)
  3n done clear
  C)
  2n done clear
  D)
  n done clear
  View Solution play_arrow

• question_answer49)
  In Spermatogenesis, the maturation phase involves:
  A)
  Formation of spermatids from primary spermatocytes through meiosis done clear
  B)
  Formation of oogonia from spermatocytes through meiosis done clear
  C)
  Growth of spermatogonia into primary spermatocytes done clear
  D)
  Formation of spermatogonia from gonocytes through mitosis. done clear
  View Solution play_arrow

• question_answer50)
  Secondary spermatocytes are :
  A)
  Haploids done clear
  B)
  Diploids done clear
  C)
  Triploids done clear
  D)
  Tetraploids done clear
  View Solution play_arrow

• question_answer51)

  Directions : (51 - 55)

  Read the passage given below and answer the following questions.

  The process of formation of a mature female gamete is called oogenesis which is markedly different from spermatogenesis. Oogenesis is initiated during the embryonic development stage when a couple of million gamete mother cells or oogonia are formed within each foetal ovary; no more oogonia are formed and added after birth. These cells start division and enter into prophase-I of the meiotic division and get temporarily arrested at that stage, called primary oocytes. Each primary oocyte then gets surrounded by a layer of granulosa cells and then called the primary follicle. A large number of these follicles degenerate, i.e. follicular atresia and sack rollicks are called atretic follicles during the phase from birth to puberty. Therefore, at puberty only 60, 000 to 80, 000 primary follicles are left in each ovary. The primary follicles get surrounded by more layers of granulosa cells and a new theca and called secondary follicles. The secondary follicle soon transforms into a tertiary follicle which is characterised by a fluid filled cavity called antrum or liquor folliculi. The theca layer is organised into an inner theca interna and an outer theca externa. A solid mass of follicular cells that the developing ovarian follicle is called cumulus oophorus or ovaricus formed by granulose cells, important to note that it is at this stage that the primary oocyte within the tertiary follicle grows in size and completes its first meiotic division. It is an unequal division resulting in the formation of a large haploid secondary oocyte and a tiny first polar body or polocyte. The secondary oocyte retains bulk of the nutrient rich cytoplasm of the primary oocyte. The tertiary follicle further changes into the mature follicle or Graafian follicle.

  The secondary oocyte forms a new membrane called zona pellucida surrounding it. The Graafian follicle now ruptures to release the secondary oocyte (ovum) from the ovary by the process called ovulation. The empty follicles fill with a yellow pigment lutin to form.

  After ovulation, the collapsed ovarian follicle shrinks and becomes filled with cells to form :
  A)
  Corpus atresia done clear
  B)
  Corpus adiposum done clear
  C)
  Corpus luteum done clear
  D)
  Corpus albicans done clear
  View Solution play_arrow

• question_answer52)
  Egg released by the Graafian follicle is surrounded by :
  A)
  Zona pellucida done clear
  B)
  Vitelline membrane done clear
  C)
  Plasma membrane done clear
  D)
  All of these done clear
  View Solution play_arrow

• question_answer53)
  5 oogonia yield 10 primary oocytes, then how many ova are produced on completion of oogenesis?
  A)
  5 done clear
  B)
  10 done clear
  C)
  20 done clear
  D)
  30    done clear
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• question_answer54)
  Corpus luteum or yellow gland in mammals occurs in :
  A)
  Skin and acts as pain receptor done clear
  B)
  Heart and initiates atrial contraction done clear
  C)
  Ovaries and produce progesterone done clear
  D)
  Brain and connects lobes of cerebrum done clear
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• question_answer55)
  Graafian follicles are formed from :
  A)
  Stroma of ovaries done clear
  B)
  Columnar epithelium of testes done clear
  C)
  Germinal epithelium of ovaries done clear
  D)
  Assembly of ribosomes in bacteria done clear
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