Free Reproduction MCQs with Answers
1,220 Reproduction MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Human reproduction covers the male and female reproductive organs, gamete formation, fertilization, implantation and hormonal regulation. The menstrual cycle includes ovarian and uterine changes controlled by pituitary and ovarian hormones, while sexually transmitted diseases are studied through their causes, transmission, symptoms, prevention and effects on fertility.
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- A. ovaries
- B. uterus
- C. oviducts
- D. vagina
Explanation: The ovaries are both the source of egg cells and an endocrine gland, releasing the hormones that control the menstrual cycle and…
Correct answer: ovaries22. The inner lining of the uterus, which thickens each cycle and is shed during menstruation, is the
- A. perimetrium
- B. endometrium
- C. myometrium
- D. cervix
Explanation: The endometrium is the hormonally responsive layer where the embryo implants.
Correct answer: endometrium- A. seminal vesicles
- B. prostate gland
- C. epididymis
- D. urethra
Explanation: Sperm leaving the seminiferous tubules are not yet motile; they gain the ability to swim while passing through the coiled epididymis where…
Correct answer: epididymis- A. glucose
- B. sucrose
- C. lactose
- D. fructose
Explanation: Fructose provides the energy that powers the tail of the sperm during its journey.
Correct answer: fructose- A. sperm production needs a temperature slightly below body temperature
- B. the testes are too large to fit inside the abdomen
- C. testosterone breaks down at body temperature
- D. sperm must be released directly to the outside
Explanation: Spermatogenesis fails at the normal 37 degrees of the abdomen, so the scrotum keeps the testes about two degrees cooler.
Correct answer: sperm production needs a temperature slightly below body temperature- A. one artery and one vein
- B. two arteries and one vein
- C. two arteries and two veins
- D. one artery and two veins
Explanation: Two umbilical arteries carry deoxygenated blood and wastes from fetus to placenta, while the single umbilical vein returns oxygenated…
Correct answer: two arteries and one vein- A. meiosis
- B. gastrulation
- C. cleavage
- D. implantation
Explanation: Cleavage divides the zygote into a ball of smaller cells as it travels down the oviduct, forming the morula and then the blastocyst.
Correct answer: cleavage- A. Prostate gland
- B. Vas deferens
- C. Seminal vesicle
- D. Uterus
Explanation: The uterus belongs to the female system, where it nourishes the developing fetus.
Correct answer: Uterus- A. testosterone
- B. oestrogen
- C. progesterone
- D. insulin
Explanation: Testosterone from the Leydig cells stimulates the development of male secondary sexual characteristics and continues to support sperm…
Correct answer: testosterone- A. oviduct
- B. cervix
- C. ovary
- D. urethra
Explanation: The cervix produces mucus that changes through the cycle, guides sperm and protects the uterus during pregnancy.
Correct answer: cervix- A. ovulation
- B. the shedding of the endometrium
- C. the development of follicles in the ovary
- D. the formation of the placenta
Explanation: FSH, follicle stimulating hormone, recruits a batch of follicles at the beginning of the cycle, and the growing follicle then secretes…
Correct answer: the development of follicles in the ovary32. During the first half of the menstrual cycle, the hormone that rebuilds the lining of the uterus is
- A. progesterone
- B. LH
- C. FSH
- D. oestrogen
Explanation: Oestrogen from the developing follicle drives the endometrium to proliferate after menstruation.
Correct answer: oestrogen- A. maintains the thickened endometrium ready for implantation
- B. immediately triggers menstruation
- C. stimulates a second ovulation
- D. dissolves the zona pellucida of the egg
Explanation: Progesterone makes the endometrium glandular and rich in blood supply, the state needed for an embryo to implant.
Correct answer: maintains the thickened endometrium ready for implantation- A. ovary itself
- B. anterior pituitary through negative feedback
- C. posterior pituitary
- D. hypothalamus releasing oxytocin
Explanation: Oestrogen feeds back on the anterior pituitary to reduce FSH, which prevents several follicles from maturing at once.
Correct answer: anterior pituitary through negative feedback- A. of menstruation itself
- B. before the follicle begins to grow
- C. between ovulation and the start of the next menstruation
- D. during which the egg is fertilised
Explanation: After ovulation the corpus luteum secretes progesterone for about fourteen days, the luteal phase.
Correct answer: between ovulation and the start of the next menstruation- A. killing sperm in the vagina
- B. blocking the oviducts mechanically
- C. thickening the cervical mucus only
- D. suppressing ovulation through their oestrogen and progesterone content
Explanation: The steady hormones of the pill inhibit FSH and LH, so no follicle matures and no egg is released.
Correct answer: suppressing ovulation through their oestrogen and progesterone content- A. degenerates into a scar called the corpus albicans
- B. continues to grow throughout the cycle
- C. develops into the placenta
- D. starts secreting hCG
Explanation: Without hCG from an embryo, the corpus luteum survives only about ten days and then degenerates, its progesterone falling to trigger…
Correct answer: degenerates into a scar called the corpus albicans- A. ovary
- B. anterior pituitary gland
- C. uterus
- D. thyroid gland
Explanation: The anterior pituitary releases both gonadotropins under direction from hypothalamic GnRH.
Correct answer: anterior pituitary gland- A. 14 days
- B. 21 days
- C. 28 days
- D. 35 days
Explanation: Counting from the first day of one menstruation to the day before the next gives roughly 28 days, though normal cycles vary between about…
Correct answer: 28 days- A. a virus
- B. a fungus
- C. a protozoan
- D. the bacterium Treponema pallidum
Explanation: Treponema pallidum is a spirochaete bacterium, which is why syphilis responds to penicillin.
Correct answer: the bacterium Treponema pallidum