Human reproduction practice · Easy

Option A (Penis) is correct because the labia majora in females and the penis in males develop from the same embryonic tissue.

Option A (Secondary oocyte) is correct because the ovum that is released during ovulation is actually a secondary oocyte, arrested in metaphase II.

Option A is correct because parturition (childbirth) occurs after pregnancy, and the signal for it does indeed originate from the fully developed fetus.

Option D (In the germinal epithelium of the seminiferous tubules) is correct because Sertoli cells are located within the seminiferous tubules and support spermatogenesis.

Option C (16) is correct because each primary spermatocyte undergoes meiosis I and II to produce 4 spermatids, which then differentiate into 4 spermatozoa. Therefore, four primary spermatocytes will produce 4 x 4 = 16 spermatozoa.

Option C (Tertiary follicle) is correct because the theca layer differentiates into the theca interna and theca externa during the tertiary follicle stage of oogenesis.

Option B (44) is correct because human primary spermatocytes have 46 chromosomes, including 2 sex chromosomes and 44 autosomes.

Option C (Gametogenesis $\to$ Insemination $\to$ Fertilization $\to$ Implantation $\to$ Gestation) is correct because it represents the correct order of events in reproduction.

Option A (Head) is correct because the head of the sperm, containing the nucleus with genetic material, enters the ovum during fertilization.

Option C (Both (1) and (2)) is correct because the enlarged end of the penis, called the glans penis, is covered by a retractable fold of skin known as both the foreskin and the prepuce.

Option B (Spermatogenesis) is correct because the lower temperature in the scrotal sac is optimal for spermatogenesis.

Option B (During pregnancy) is correct because hCG and hPL are hormones specifically produced by the placenta during pregnancy.

Option C (During follicular phase of menstrual cycle) is correct because the primary oocyte completes meiosis I within the developing follicle during the follicular phase.

Option C (Epididymis, Abdomen, urinary bladder) is correct because the epididymis leads to the vas deferens, which ascends to the abdomen and loops over the urinary bladder.

Option B (Labia majora) is correct because the labia majora in females are homologous to the scrotum in males, both originating from the same embryonic tissue.

Option B (Vas deferens Ejaculatory duct) is correct because the vas deferens receives a duct from the seminal vesicle and then opens into the urethra as the ejaculatory duct.

Option B (250) is correct because each human testis has approximately 250 compartments called testicular lobules.

Option C (It is a disease found in older people) is correct because menopause is a natural biological process, not a disease.

Option B (FSH) is correct because Follicle-Stimulating Hormone (FSH) is crucial for initiating and maintaining spermatogenesis in the seminiferous tubules of the testes.

Option B (Penis) is correct because the penis is the external male reproductive organ.

Option B (Second trimester) is correct because fine hair (lanugo) begins to cover the fetus's body by the end of the second trimester (around the fifth or sixth month of pregnancy).

Option D (Oestrogen) is correct because estrogen stimulates the proliferation of the endometrium during the follicular phase.

Option C (A-Spermatogenesis; B-Sertoli cell) is correct because androgens stimulate spermatogenesis, and FSH acts on Sertoli cells to promote spermiogenesis.

Option A (Primary spermatocyte) is correct because primary spermatocytes are diploid cells that undergo meiosis I to form two haploid secondary spermatocytes.

Option B (Inguinal canals) is correct because the scrotum is connected to the abdomen or pelvic cavity through the inguinal canals, which allow passage of the spermatic cord.

Option C (Foetal ejection reflex triggers release of oxytocin from foetal pituitary) is correct because the fetal ejection reflex triggers the release of oxytocin from the *maternal* pituitary, not the fetal pituitary.

Option A (Corpus luteum) is correct because after releasing the ovum, the Graafian follicle transforms into the corpus luteum, which secretes progesterone.

Option D (All of the above) is correct because the LH surge causes the Graafian follicle to rupture, releasing the ovum, which is ovulation.

Option A (Labia Minora) is correct because the labia minora are external genitalia, while fimbriae, infundibulum, and isthmus are parts of the fallopian tube (internal genitalia).

Option B (Addition of one X chromosome) is correct because it represents a chromosomal abnormality (Klinefelter syndrome) that is not a typical characteristic of a normal human male.