Human Reproduction: Reproductive Organs, Menstrual Cycle, Fertilisation, Pregnancy, Birth Control and STIs

1. Which structure produces sperm cells?

A prostate gland
B testis
C seminal vesicle
D urethra

2. Which structure carries sperm from the testes towards the urethra?

A sperm duct
B oviduct
C ureter
D cervix

3. Which row correctly matches male reproductive structure and function?

A testes: produce urine
B prostate gland: produces sperm cells
C sperm duct: transports sperm
D scrotum: produces testosterone only

4. Which structure produces ova?

A uterus
B ovary
C cervix
D vagina

5. Which structure is the usual site of fertilisation in humans?

A uterus
B cervix
C oviduct
D vagina

6. Which structure is the usual site of implantation?

A ovary
B uterus lining
C oviduct
D cervix

7. Which statement about sperm cells is correct?

A they contain a tail for movement and many mitochondria for energy release
B they contain a large food store and no nucleus
C they contain chloroplasts to release energy
D they are larger than ova and cannot move

8. Which statement about ova is correct?

A they are small, motile cells with tails
B they contain food stores and a haploid nucleus
C they are produced in the testes
D they contain millions of sperm nuclei

9. Which sequence correctly shows the path of sperm during ejaculation?

A testis → sperm duct → urethra → penis
B testis → ureter → bladder → urethra
C prostate gland → oviduct → uterus → penis
D scrotum → cervix → urethra → vagina

10. Which structure prevents sperm from entering the uterus during some forms of barrier contraception?

A diaphragm/cap
B intrauterine device only
C ovary
D testes

11. Which hormone stimulates maturation of an egg follicle in the ovary?

A FSH
B LH
C progesterone
D adrenaline

12. Which hormone triggers ovulation?

A FSH
B LH
C insulin
D ADH

Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total A Grades, 11 World Records and 7 Distinctions, Educate A Change.

13. Which hormone helps maintain the uterus lining after ovulation?

A progesterone
B glucagon
C testosterone
D thyroxine

14. Which hormone is mainly produced by the follicle before ovulation and helps repair/thicken the uterus lining?

A oestrogen
B progesterone
C adrenaline
D FSH only

15. In a typical 28-day menstrual cycle, ovulation occurs around

A day 1
B day 7
C day 14
D day 28

16. What happens during menstruation?

A the ovary releases a mature egg
B the uterus lining breaks down and leaves the body
C the placenta forms immediately
D sperm are produced by the ovaries

17. Which sequence is most accurate for the menstrual cycle?

A menstruation → uterus lining thickens → ovulation → lining maintained
B ovulation → menstruation → lining maintained → fertilisation
C menstruation → fertilisation → ovulation → lining breaks down
D lining maintained → menstruation → ovulation → follicle disappears

18. If fertilisation does not occur, why does menstruation happen?

A progesterone levels fall, so the uterus lining is no longer maintained
B FSH remains zero, so the ovary becomes the uterus
C LH stays high forever, so the egg becomes sperm
D oestrogen converts the lining into placenta

19. Which statement about negative feedback in the menstrual cycle is correct?

A high oestrogen levels can reduce FSH secretion
B progesterone is produced only by the testes
C LH prevents ovulation in all cases
D FSH destroys the uterus lining directly

20. Which row correctly matches hormone and function?

A FSH: stimulates follicle development
B LH: maintains pregnancy for nine months only
C progesterone: triggers ovulation directly
D oestrogen: causes sperm production

21. Which event occurs immediately after fertilisation?

A formation of a zygote
B formation of the placenta
C menstruation begins
D sperm cells become ova

22. Which statement about fertilisation is correct?

A it is fusion of male and female gamete nuclei
B it is transfer of sperm to the vagina
C it is release of an ovum from the ovary
D it is attachment of embryo to uterus lining

23. Which statement about implantation is correct?

A sperm fuses with ovum in the vagina
B embryo embeds in the uterus lining
C ovary releases an ovum into the oviduct
D placenta detaches from the uterus wall

24. Which structure allows exchange of substances between maternal blood and fetal blood without usually mixing them directly?

A placenta
B ovary
C cervix
D prostate gland

25. Which substance diffuses from mother to fetus across the placenta?

A oxygen
B carbon dioxide
C urea
D lactic acid only

Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total A Grades, 11 World Records and 7 Distinctions, Educate A Change.

26. Which substances diffuse from fetus to mother across the placenta?

A oxygen and glucose
B carbon dioxide and urea
C antibodies and oxygen only
D progesterone and starch

27. Which statement about the umbilical cord is correct?

A it connects the fetus to the placenta
B it connects the ovary to the uterus
C it produces sperm cells
D it prevents fertilisation

28. Which feature of the placenta increases exchange efficiency?

A large surface area and thin barrier
B thick waterproof wall and no blood supply
C no villi and no diffusion gradient
D direct mixing of all maternal and fetal blood

29. Which statement about amniotic fluid is correct?

A it protects the fetus from mechanical shock
B it transports sperm to the oviduct
C it produces ova
D it forms the uterus lining

30. Why does the fetus need the placenta for gas exchange?

A fetal lungs are not used for breathing air before birth
B fetal blood contains no haemoglobin
C fetus has no blood vessels
D oxygen cannot diffuse through any membrane

31. Which statement about the cervix is correct?

A it is the lower opening of the uterus leading to the vagina
B it produces ova every month
C it produces sperm cells
D it is where fertilisation usually occurs

32. Which statement about the vagina is correct?

A it receives the penis during sexual intercourse and acts as the birth canal
B it produces testosterone
C it transports urine from kidney to bladder
D it is the usual site of fertilisation

33. Which contraceptive method also helps reduce transmission of many STIs?

A condom
B rhythm method
C contraceptive implant only
D surgical sterilisation only

34. Which contraceptive method mainly prevents ovulation by using hormones?

A condom
B contraceptive pill
C diaphragm
D withdrawal method

35. Which method prevents fertilisation by blocking the sperm ducts?

A vasectomy
B tubal ligation
C intrauterine device
D cervical cap

36. Which method prevents ova from travelling through the oviducts?

A tubal ligation
B vasectomy
C condom
D spermicide only

37. Which statement about condoms is correct?

A they are barrier methods that reduce sperm entry into the vagina
B they stop ovaries producing eggs permanently
C they contain FSH to trigger ovulation
D they increase STI transmission

38. Which statement about an intrauterine device is correct?

A it is placed in the uterus and may prevent implantation or fertilisation
B it is swallowed daily to stop sperm production
C it covers the penis during intercourse
D it surgically removes the ovaries

Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total A Grades, 11 World Records and 7 Distinctions, Educate A Change.

39. Which method is least reliable because it depends strongly on predicting fertile days and abstaining during them?

A rhythm method
B vasectomy
C tubal ligation
D implant

40. Which statement about birth control is correct?

A hormonal methods can affect ovulation and the uterus lining
B barrier methods always stop ovulation
C surgical sterilisation is designed to be temporary for one day only
D all contraceptive methods protect equally against STIs

41. Which disease is a sexually transmitted infection caused by HIV?

A AIDS
B malaria
C scurvy
D cholera

42. Which STI is caused by a bacterium and may be treated with antibiotics if detected early?

A HIV
B gonorrhoea
C malaria
D influenza

43. Which statement about HIV transmission is correct?

A it can be transmitted through infected blood and sexual fluids
B it is spread by sharing plates and cups
C it is transmitted by coughing across a room
D it is spread by mosquito bites like malaria

44. Why can untreated STIs increase infertility risk?

A they may damage reproductive organs such as oviducts or sperm ducts
B they always prevent puberty from starting
C they convert ova into red blood cells
D they stop all hormone production instantly

45. Which practice reduces the risk of STI transmission?

A using condoms correctly
B sharing needles
C having unprotected sex with multiple partners
D avoiding medical testing after symptoms appear

46. Which statement about puberty is correct?

A it is controlled by hormones and leads to sexual maturity
B it is caused by antibiotics destroying gametes
C it occurs only in males
D it stops production of sex hormones permanently

47. Which change usually occurs in males during puberty?

A testes begin producing sperm and testosterone levels increase
B ovaries begin releasing ova
C uterus lining begins a menstrual cycle
D placenta forms every month

48. Which change usually occurs in females during puberty?

A ovulation and menstruation begin
B sperm ducts start producing ova
C prostate gland starts producing eggs
D testes descend into the scrotum

49. Which row correctly compares male and female gametes?

A sperm: large and non-motile; ovum: small and motile
B sperm: haploid and motile; ovum: haploid and larger with food reserves
C sperm: diploid; ovum: haploid
D sperm: produced in uterus; ovum: produced in testes

50. Which statement is correct?

A fertilisation restores the diploid chromosome number in the zygote
B gametes are diploid cells produced by mitosis only
C implantation occurs before fertilisation
D the placenta produces sperm cells after birth

Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total A Grades, 11 World Records and 7 Distinctions, Educate A Change.

1. Answer: B
   A is wrong because the prostate gland adds fluid to semen; it does not produce sperm.
   B is correct because the testes produce sperm cells.
   C is wrong because seminal vesicles add fluid containing nutrients to semen.
   D is wrong because the urethra carries semen/urine out of the body; it does not produce sperm.

2. Answer: A
   A is correct because the sperm ducts carry sperm from the testes towards the urethra.
   B is wrong because the oviduct is part of the female reproductive system.
   C is wrong because the ureter carries urine from kidney to bladder.
   D is wrong because the cervix is the lower opening of the uterus.

3. Answer: C
   A is wrong because testes produce sperm and testosterone, not urine.
   B is wrong because sperm are produced in the testes, not the prostate gland.
   C is correct because the sperm duct transports sperm.
   D is wrong because the scrotum holds the testes outside the body; it does not produce testosterone.

4. Answer: B
   A is wrong because the uterus is where implantation and fetal development occur.
   B is correct because the ovaries produce ova.
   C is wrong because the cervix is the opening between uterus and vagina.
   D is wrong because the vagina receives the penis and acts as the birth canal.

5. Answer: C
   A is wrong because the uterus is the site of implantation, not usually fertilisation.
   B is wrong because the cervix is not the usual site of fertilisation.
   C is correct because fertilisation usually occurs in the oviduct.
   D is wrong because the vagina receives semen but is not the usual fertilisation site.

6. Answer: B
   A is wrong because the ovary produces ova.
   B is correct because implantation occurs in the uterus lining.
   C is wrong because fertilisation usually occurs in the oviduct.
   D is wrong because the cervix is the lower opening of the uterus.

7. Answer: A
   A is correct because sperm cells have a tail for movement and many mitochondria to release energy for swimming.
   B is wrong because sperm have a nucleus and do not contain a large food store.
   C is wrong because animal cells do not have chloroplasts.
   D is wrong because ova are larger and non-motile; sperm are smaller and motile.

8. Answer: B
   A is wrong because ova are large and non-motile, without tails.
   B is correct because ova contain food stores and a haploid nucleus.
   C is wrong because ova are produced in ovaries, not testes.
   D is wrong because an ovum contains one female haploid nucleus, not millions of sperm nuclei.

9. Answer: A
   A is correct because sperm travel testis → sperm duct → urethra → penis during ejaculation.
   B is wrong because the ureter carries urine, not sperm.
   C is wrong because oviduct and uterus are female reproductive structures.
   D is wrong because sperm do not pass through the cervix before ejaculation.

10. Answer: A
    A is correct because a diaphragm/cap covers the cervix and blocks sperm from entering the uterus.
    B is wrong because an intrauterine device is placed in the uterus and does not mainly act by covering the cervix.
    C is wrong because the ovary produces ova.
    D is wrong because testes produce sperm.

11. Answer: A
    A is correct because FSH stimulates follicle development and maturation in the ovary.
    B is wrong because LH triggers ovulation.
    C is wrong because progesterone maintains the uterus lining.
    D is wrong because adrenaline is not a menstrual cycle hormone.

12. Answer: B
    A is wrong because FSH stimulates follicle development.
    B is correct because LH triggers ovulation.
    C is wrong because insulin controls blood glucose.
    D is wrong because ADH controls water reabsorption.

Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total A Grades, 11 World Records and 7 Distinctions, Educate A Change.

13. Answer: A
    A is correct because progesterone helps maintain the uterus lining after ovulation.
    B is wrong because glucagon raises blood glucose.
    C is wrong because testosterone is the main male sex hormone.
    D is wrong because thyroxine affects metabolic rate.

14. Answer: A
    A is correct because oestrogen is produced mainly by the follicle before ovulation and helps repair/thicken the uterus lining.
    B is wrong because progesterone is produced mainly after ovulation by the corpus luteum.
    C is wrong because adrenaline is secreted by adrenal glands.
    D is wrong because FSH stimulates follicle development, but oestrogen is the hormone that thickens the lining.

15. Answer: C
    A is wrong because day 1 is usually the start of menstruation.
    B is wrong because day 7 is usually during lining repair/thickening.
    C is correct because ovulation usually occurs around day 14 in a 28-day cycle.
    D is wrong because day 28 is near the end of the cycle.

16. Answer: B
    A is wrong because ovulation is release of an ovum.
    B is correct because menstruation is the breakdown and loss of the uterus lining.
    C is wrong because the placenta forms after implantation and early embryo development.
    D is wrong because ovaries do not produce sperm.

17. Answer: A
    A is correct because the usual sequence is menstruation → lining thickens → ovulation → lining maintained.
    B is wrong because menstruation does not normally happen immediately after ovulation.
    C is wrong because fertilisation happens after ovulation, not before it.
    D is wrong because the sequence is scrambled.

18. Answer: A
    A is correct because if fertilisation does not occur, progesterone falls and the uterus lining is no longer maintained.
    B is wrong because the ovary does not become the uterus.
    C is wrong because LH does not stay high forever and eggs do not become sperm.
    D is wrong because oestrogen does not convert the lining into placenta.

19. Answer: A
    A is correct because high oestrogen can inhibit FSH secretion, preventing too many follicles developing.
    B is wrong because progesterone is mainly produced by ovaries after ovulation and by placenta during pregnancy.
    C is wrong because LH triggers ovulation.
    D is wrong because FSH does not destroy the uterus lining.

20. Answer: A
    A is correct because FSH stimulates follicle development.
    B is wrong because LH triggers ovulation.
    C is wrong because progesterone maintains the uterus lining; LH triggers ovulation.
    D is wrong because oestrogen does not cause sperm production.

21. Answer: A
    A is correct because fertilisation forms a zygote.
    B is wrong because the placenta forms later.
    C is wrong because menstruation does not begin immediately after fertilisation.
    D is wrong because sperm cells do not become ova.

22. Answer: A
    A is correct because fertilisation is fusion of male and female gamete nuclei.
    B is wrong because transfer of sperm into the vagina is insemination.
    C is wrong because release of an ovum is ovulation.
    D is wrong because attachment of embryo to uterus lining is implantation.

23. Answer: B
    A is wrong because sperm usually fuses with ovum in the oviduct, not the vagina.
    B is correct because implantation is when the embryo embeds in the uterus lining.
    C is wrong because ovum release is ovulation.
    D is wrong because placenta detachment is not implantation.

24. Answer: A
    A is correct because the placenta allows exchange between maternal and fetal blood without direct mixing in normal conditions.
    B is wrong because the ovary produces ova.
    C is wrong because the cervix is the opening into the uterus.
    D is wrong because the prostate gland is male and adds fluid to semen.

25. Answer: A
    A is correct because oxygen diffuses from mother to fetus across the placenta.
    B is wrong because carbon dioxide mainly diffuses from fetus to mother.
    C is wrong because urea mainly diffuses from fetus to mother.
    D is wrong because lactic acid is not the key substance moving mother to fetus here.

Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total A Grades, 11 World Records and 7 Distinctions, Educate A Change.

26. Answer: B
    A is wrong because oxygen and glucose move from mother to fetus.
    B is correct because carbon dioxide and urea diffuse from fetus to mother for removal.
    C is wrong because oxygen moves to the fetus, not from fetus to mother.
    D is wrong because starch is too large and not transported this way.

27. Answer: A
    A is correct because the umbilical cord connects the fetus to the placenta.
    B is wrong because the ovary is not connected to the uterus by the umbilical cord.
    C is wrong because sperm cells are produced in testes.
    D is wrong because the umbilical cord does not prevent fertilisation.

28. Answer: A
    A is correct because the placenta has a large surface area and thin barrier for efficient diffusion.
    B is wrong because a thick wall and no blood supply would reduce exchange.
    C is wrong because villi increase surface area.
    D is wrong because maternal and fetal blood usually do not directly mix.

29. Answer: A
    A is correct because amniotic fluid cushions and protects the fetus from mechanical shock.
    B is wrong because sperm are transported through the female reproductive tract, not amniotic fluid.
    C is wrong because ova are produced by ovaries.
    D is wrong because the uterus lining forms through menstrual cycle hormones.

30. Answer: A
    A is correct because fetal lungs are not used for breathing air before birth, so gas exchange occurs through the placenta.
    B is wrong because fetal blood does contain haemoglobin.
    C is wrong because the fetus has blood vessels.
    D is wrong because oxygen can diffuse through the placental barrier.

31. Answer: A
    A is correct because the cervix is the lower opening of the uterus leading to the vagina.
    B is wrong because ovaries produce ova.
    C is wrong because testes produce sperm.
    D is wrong because fertilisation usually occurs in the oviduct.

32. Answer: A
    A is correct because the vagina receives the penis during sexual intercourse and acts as the birth canal.
    B is wrong because testosterone is produced mainly in testes.
    C is wrong because ureters transport urine from kidneys to bladder.
    D is wrong because fertilisation usually occurs in the oviduct.

33. Answer: A
    A is correct because condoms reduce sperm transfer and also reduce transmission of many STIs.
    B is wrong because the rhythm method does not protect against STIs.
    C is wrong because implants prevent pregnancy but do not protect against STIs.
    D is wrong because sterilisation prevents gamete transport but does not protect against STIs.

34. Answer: B
    A is wrong because condoms are barrier methods.
    B is correct because the contraceptive pill uses hormones to prevent ovulation.
    C is wrong because a diaphragm is a barrier method.
    D is wrong because withdrawal is not hormonal.

35. Answer: A
    A is correct because vasectomy blocks/cuts the sperm ducts.
    B is wrong because tubal ligation blocks the oviducts.
    C is wrong because an intrauterine device is placed in the uterus.
    D is wrong because a cervical cap covers the cervix.

36. Answer: A
    A is correct because tubal ligation blocks/cuts the oviducts, preventing ova from travelling properly.
    B is wrong because vasectomy blocks sperm ducts in males.
    C is wrong because condoms are barrier methods.
    D is wrong because spermicide kills sperm but does not block oviducts.

37. Answer: A
    A is correct because condoms are barrier methods that reduce sperm entry into the vagina.
    B is wrong because condoms do not stop ovary function.
    C is wrong because condoms do not contain FSH.
    D is wrong because condoms reduce, not increase, STI transmission.

38. Answer: A
    A is correct because an intrauterine device is placed in the uterus and may prevent implantation or fertilisation.
    B is wrong because swallowed daily contraception describes pills, not IUDs.
    C is wrong because a condom covers the penis.
    D is wrong because an IUD does not surgically remove ovaries.

Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total A Grades, 11 World Records and 7 Distinctions, Educate A Change.

39. Answer: A
    A is correct because the rhythm method depends on predicting fertile days and abstaining, so it is less reliable.
    B is wrong because vasectomy is a highly reliable surgical method.
    C is wrong because tubal ligation is a highly reliable surgical method.
    D is wrong because implants are generally reliable hormonal methods.

40. Answer: A
    A is correct because hormonal methods can prevent ovulation and alter the uterus lining or cervical mucus.
    B is wrong because barrier methods physically block sperm; they do not stop ovulation.
    C is wrong because surgical sterilisation is intended to be permanent.
    D is wrong because only barrier methods such as condoms reduce STI transmission significantly.

41. Answer: A
    A is correct because HIV infection can lead to AIDS.
    B is wrong because malaria is caused by Plasmodium.
    C is wrong because scurvy is vitamin C deficiency.
    D is wrong because cholera is a bacterial disease spread by contaminated water/food.

42. Answer: B
    A is wrong because HIV is caused by a virus, so antibiotics do not cure it.
    B is correct because gonorrhoea is caused by bacteria and may be treated with antibiotics if detected early.
    C is wrong because malaria is caused by a protoctist.
    D is wrong because influenza is caused by a virus.

43. Answer: A
    A is correct because HIV can be transmitted through infected blood and sexual fluids.
    B is wrong because HIV is not spread by sharing plates and cups.
    C is wrong because HIV is not spread by coughing across a room.
    D is wrong because mosquitoes do not transmit HIV.

44. Answer: A
    A is correct because untreated STIs may damage reproductive organs such as oviducts or sperm ducts, increasing infertility risk.
    B is wrong because STIs do not always prevent puberty.
    C is wrong because ova do not convert into red blood cells.
    D is wrong because STIs do not instantly stop all hormone production.

45. Answer: A
    A is correct because using condoms correctly reduces STI transmission risk.
    B is wrong because sharing needles increases risk of infections such as HIV.
    C is wrong because unprotected sex with multiple partners increases STI risk.
    D is wrong because avoiding testing after symptoms appear increases the chance of untreated infection and spread.

46. Answer: A
    A is correct because puberty is controlled by hormones and leads to sexual maturity.
    B is wrong because antibiotics do not cause puberty.
    C is wrong because puberty occurs in males and females.
    D is wrong because puberty increases sex hormone activity; it does not stop it permanently.

47. Answer: A
    A is correct because during male puberty, testes begin producing sperm and testosterone levels rise.
    B is wrong because ovaries release ova in females.
    C is wrong because menstrual cycles occur in females.
    D is wrong because placenta formation occurs during pregnancy, not monthly puberty changes.

48. Answer: A
    A is correct because during female puberty, ovulation and menstruation begin.
    B is wrong because sperm ducts do not produce ova.
    C is wrong because the prostate gland does not produce eggs.
    D is wrong because testes descending into scrotum is male development.

49. Answer: B
    A is wrong because sperm are small and motile, while ova are large and non-motile.
    B is correct because sperm are haploid and motile; ova are haploid, larger and contain food reserves.
    C is wrong because sperm are haploid, not diploid.
    D is wrong because sperm are produced in testes and ova in ovaries.

50. Answer: A
    A is correct because fertilisation fuses two haploid gamete nuclei and restores the diploid chromosome number in the zygote.
    B is wrong because gametes are haploid and produced by meiosis.
    C is wrong because implantation occurs after fertilisation.
    D is wrong because the placenta does not produce sperm cells.

Written and Compiled By Sir Hunain Zia (AYLOTI), World Record Holder With 154 Total A Grades, 11 World Records and 7 Distinctions, Educate A Change.