Human reproduction practice · Medium

Option B (Drawing food for the developing cell) is correct because the trophoectoderm forms the outer layer of the blastocyst and is responsible for nutrient uptake and implantation.

Option C (If Assertion is true statement but Reason is false) is correct because secondary spermatocytes are haploid, but they are formed from primary spermatocytes undergoing meiosis I to form two *equal* secondary spermatocytes.

Option C (Both (a) and (b)) is incorrect. The adrenal gland is derived from both ectoderm and mesoderm. The adrenal cortex is derived from mesoderm, while the adrenal medulla is derived from ectoderm.

Option C (Semen) is correct because semen is the fluid containing sperm and seminal plasma that is ejaculated from the male reproductive tract.

Option B (Oxytocin) is correct because oxytocin is the hormone primarily responsible for stimulating uterine contractions during labor and delivery.

Option A (Child birth) is correct because parturition is the medical term for the process of childbirth, involving the expulsion of the fetus from the uterus.

The correct answer is A (In seminal vesicle) because sperms are stored and further matured in the seminal vesicle.

Option B ($20^{\text {th }}$ day) is correct because ovulation typically occurs 14 days before the start of the next menstrual period. With a 34-day cycle, ovulation would occur around day 20.

Option A (A-Chorion; B-Placenta) is correct because the chorion completely surrounds the embryo and contributes to the formation of the placenta.

Option C is correct because menstruation is triggered by an abrupt decline in the amount of progesterone and estrogen, hormones secreted by the ovary.

Option D (A- antrum, B- secondary follicle, C-tertiary follicle) is correct because the antrum is a fluid-filled cavity characteristic of the tertiary follicle.

Option A (The fertilized egg is placed in the womb of the mother where the gastrula period is completed) is correct because in IVF, the fertilized egg is implanted into the uterus for further development.

Option B (Development of corpus luteum) is correct because the corpus luteum develops from the Graafian follicle after ovulation, which is stimulated by LH. FSH alone cannot cause corpus luteum development, especially without the anterior pituitary.

Option A (Organs) is correct because organogenesis is the process of organ formation during embryonic development.

Option C (Theca externa and theca interna) is correct because the Graafian follicle, a mature ovarian follicle, is characterized by having theca externa and theca interna layers surrounding it.

Option B (A-200, B-300, C-60%, D-40%) is correct because a healthy human male ejaculate contains 200-300 million sperm, with at least 60% having normal shape and size and 40% showing vigorous motility.

Option C (Both (1) and (2)) is correct because the ejaculatory duct receives sperm from the vas deferens and secretions from the seminal vesicles before emptying into the urethra.

Option C (A- Primary spermatocytes, B- Secondary spermatocytes, C-Spermatozoa) is correct because it represents the correct sequence of cell types during spermatogenesis.

Option D (Vas deferens) is correct because the vas deferens is a structure specific to the male reproductive system.

Option C (Secondary spermatocytes) is correct because secondary spermatocytes are haploid cells formed after meiosis I.

Option A (9 million) is correct because, assuming an equal distribution of X and Y chromosomes, approximately half of the total sperm count will carry a Y chromosome. Therefore, 18 million / 2 = 9 million.

Option A (Acrosomal reaction) is correct because the acrosomal reaction involves the release of hyaluronidase, an enzyme that helps the sperm penetrate the zona pellucida of the egg.

Option B (A-prolactin, B-FSH, C-LH) is correct because prolactin maintains milk secretion and inhibits FSH and LH release.

Option D (Has higher affinity for oxygen than that of an adult) is correct because fetal hemoglobin has a higher affinity for oxygen to facilitate oxygen transfer from the mother's blood.

Option A is correct because both the primary oocyte and follicular cells in a Graafian follicle originate from the same oogonium through mitotic division.

Option C (Hgh) is correct because the secretion of Human Growth Hormone (HGH) reduces significantly with increasing age.

Option A (Female genital tract) is correct because capacitation, the process that enables sperm to fertilize an egg, occurs in the female reproductive tract.

Option A (Acrosome) is correct because the acrosome is a structure of the sperm cell, while the other options are parts of the female reproductive system.

The correct answer is B (Cleavage: Rapid meiotic cell division occurs inside the fallopian tube) because cleavage involves rapid MITOTIC, not meiotic, cell division.

Option C (Of endometrium wall) is correct because progesterone is essential for maintaining the endometrium lining of the uterus during pregnancy.