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. seminiferous tubules
- B. epididymis
- C. prostate gland
- D. vas deferens
Explanation: The germinal epithelium lining the seminiferous tubules of the testis divides by mitosis and then meiosis to form spermatids, which mature…
Correct answer: seminiferous tubules- A. Sertoli cells
- B. interstitial cells of Leydig
- C. germinal epithelium
- D. seminal vesicles
Explanation: The Leydig cells lie in the connective tissue between the seminiferous tubules and secrete testosterone in response to luteinising hormone…
Correct answer: interstitial cells of Leydig- A. uterus
- B. cervix
- C. ampulla of the fallopian tube
- D. ovary
Explanation: The secondary oocyte is swept into the oviduct at ovulation and meets sperm in the wide upper third, the ampulla, within about a day.
Correct answer: ampulla of the fallopian tube- A. myometrium
- B. perimetrium
- C. cervix
- D. endometrium
Explanation: The endometrium is the inner glandular lining of the uterus, thickened and richly supplied with blood by progesterone during the secretory…
Correct answer: endometrium- A. progesterone
- B. FSH
- C. LH
- D. oxytocin
Explanation: Progesterone from the corpus luteum maintains the thickened endometrium and inhibits FSH and LH so that no further follicle ripens.
Correct answer: progesterone- A. oestrogen alone
- B. luteinising hormone
- C. progesterone
- D. follicle stimulating hormone
Explanation: Rising oestrogen from the ripening follicle switches the pituitary from negative to positive feedback and produces a sudden LH surge…
Correct answer: luteinising hormone- A. 5
- B. 8
- C. 21
- D. 14
Explanation: Ovulation falls near the midpoint of the cycle, roughly fourteen days before the next period begins, because the luteal phase is the fixed…
Correct answer: 14- A. oestrogen rises sharply
- B. follicle stimulating hormone falls to zero
- C. the corpus luteum degenerates and progesterone falls
- D. the blastocyst implants in the uterine wall
Explanation: Without implantation the corpus luteum breaks down, progesterone withdrawal removes the support of the endometrium, its blood vessels…
Correct answer: the corpus luteum degenerates and progesterone falls- A. luteinising hormone
- B. follicle stimulating hormone
- C. progesterone
- D. human chorionic gonadotropin
Explanation: The chorion of the young embryo secretes hCG, which keeps the corpus luteum alive so that progesterone continues and the endometrium is…
Correct answer: human chorionic gonadotropin- A. Production of the fetus's red blood cells
- B. Exchange of oxygen and carbon dioxide
- C. Secretion of progesterone and hCG
- D. Transfer of nutrients from mother to fetus
Explanation: The fetus makes its own blood cells, first in the yolk sac and liver and later in the bone marrow, and maternal and fetal blood never…
Correct answer: Production of the fetus's red blood cells- A. the mitochondria that power the tail
- B. hydrolytic enzymes that digest the coverings of the egg
- C. the haploid nucleus
- D. contractile proteins of the flagellum
Explanation: The acrosome is a lysosome like cap over the front of the head, and its enzymes, including hyaluronidase, break down the corona radiata…
Correct answer: hydrolytic enzymes that digest the coverings of the egg- A. head
- B. acrosome
- C. middle piece
- D. tip of the tail
Explanation: A spiral sheath of mitochondria wraps the middle piece and supplies the ATP that the flagellum needs for the long journey to the oviduct.
Correct answer: middle piece- A. 23
- B. 46
- C. 44
- D. 92
Explanation: The first meiotic division is completed before ovulation and halves the chromosome number, so the secondary oocyte is haploid with 23…
Correct answer: 23- A. four functional ova
- B. two ova and two polar bodies
- C. one ovum and three polar bodies
- D. four polar bodies and no ovum
Explanation: Cytoplasmic division in oogenesis is deliberately unequal, so almost all the cytoplasm and stored food goes to one cell while the other…
Correct answer: one ovum and three polar bodies- A. a bacterium
- B. a virus
- C. a fungus
- D. a protozoan
Explanation: Neisseria gonorrhoeae is a diplococcus bacterium that infects the mucous membranes of the urinary and reproductive tracts, and because it…
Correct answer: a bacterium- A. Gonorrhoea
- B. Syphilis
- C. Genital herpes
- D. Candidiasis
Explanation: Syphilis is caused by the spiral bacterium Treponema pallidum, beginning as a painless ulcer, then a body wide rash, then a long latent…
Correct answer: Syphilis- A. Gonorrhoea
- B. Syphilis
- C. Chlamydia
- D. Genital herpes
Explanation: Genital herpes is caused by herpes simplex virus, and antibiotics act only on bacterial structures and pathways, so they are useless…
Correct answer: Genital herpes- A. taking an antibiotic after every possible exposure
- B. vaccination, since a vaccine exists for every such infection
- C. washing thoroughly after exposure
- D. avoiding contact with infected persons and using barrier protection
Explanation: Prevention works by stopping the exchange of infected body fluids, so avoiding contact with an infected person and using a barrier are…
Correct answer: avoiding contact with infected persons and using barrier protection- A. chorion
- B. allantois
- C. amnion
- D. yolk sac
Explanation: The amnion encloses the amniotic fluid in which the fetus floats, spreading any pressure evenly, keeping the temperature steady and…
Correct answer: amnion- A. deoxygenated blood from the fetus to the placenta
- B. oxygenated blood from the placenta to the fetus
- C. fetal urine to the placenta for disposal
- D. maternal blood directly into the fetal circulation
Explanation: The cord contains two arteries and one vein, and as always the vein is named for the direction of flow towards the heart, so it brings…
Correct answer: oxygenated blood from the placenta to the fetusReproduction MCQs: common questions
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