S3 Science: Human Reproduction And Puberty (Paper 3 (challenge))

S3 Science: Human Reproduction and Puberty (Paper 3 (challenge))

2026-11-14

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Tutor Prep Guide · the male and female reproductive systems, sperm and eggs, fertilisation and implantation, the menstrual cycle, puberty and sex hormones, pregnancy and fetal development, the placenta and umbilical cord, twins, contraception and sexually transmitted infections

S3 Science: Human Reproduction and Puberty (Paper 3 (challenge))

This paper puts reproduction knowledge onto timelines and quantities: the order of ducts for sperm, the site of implantation, the role of the umbilical cord, telling identical from fraternal twins, working out the fertile window, ovulation in a 35 day cycle, ovulations over 40 years and the yearly volume of menstrual loss.

Direct answers　The order is testis, epididymis, sperm duct, urethra; implantation is in the uterine lining; the cord carries materials; different sexes mean fraternal twins; the fertile window is day 11 to 15, five days; a 35 day cycle ovulates on day 21; 40 years gives 480 ovulations; 13 periods of 40 millilitres gives 520 millilitres; pregnancy is still possible during a period.

01　Paper details (check answers afterwards)

Item	Detail
Questions	10
Suggested time	20
Difficulty mix	Foundation 3 · Intermediate 3 · Challenge 3 · Error redo 1
Chapter	Chapter: S3 Science: Human Reproduction and Puberty
Level	S3

02　Questions (10 items)

FoundationWhat is the correct order for sperm leaving the testis?
FoundationWhere does the zygote finally implant?
FoundationWhat is the function of the umbilical cord?
IntermediateTwins of different sexes must be identical or fraternal?
IntermediateOvulation is on day 14 of a 28 day cycle, an egg lives about one day and sperm about three days. Which days are the most fertile?
IntermediateBesides preventing pregnancy, what else does a condom do?
ChallengeIn a 35 day cycle with a luteal phase of about 14 days, on which day is ovulation?
ChallengeA woman has her first period at 12 and menopause at 52, 40 years, releasing one egg a month. How many eggs in total?
ChallengeIn a 28 day cycle about 40 millilitres of blood are lost each period, with 13 periods a year. What is the yearly loss?
Error redoCommon error: pregnancy is impossible during a period. What is correct?

03　Answers and one-line notes

#	Answer	One-line note
1	Testis, epididymis, sperm duct, urethra	The epididymis is where sperm mature and are stored for a time.
2	In the lining of the uterus	Only after implantation does the placenta connection with the mother form.
3	It links the fetus to the placenta and carries nutrients, oxygen and waste	The cord contains blood vessels, and materials pass across the placental exchange surface.
4	Fraternal	Identical twins split from one zygote, so their genes and therefore their sex are the same.
5	Day 11 to day 15, five days in all	14 minus 3 gives 11 and 14 plus 1 gives 15, which counts five days including both ends.
6	It reduces the spread of sexually transmitted infections	It is a physical barrier that blocks semen and pathogens alike.
7	Around day 21	35 minus 14 gives 21.
8	480 eggs	40 times 12 gives 480, though pregnancy and irregular cycles make the real figure lower.
9	520 millilitres	40 times 13 gives 520.
10	Pregnancy is still possible, because sperm survive for days and short cycles can ovulate early	Rhythm methods are unreliable; proper contraception is the safe answer.

04　What to do after marking

After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
Repeat the same item two days later; move to the next paper only when both attempts are correct.
Parents only need the answer and note columns; there is no need to explain every item.

Sort reproduction questions by place and order first: the testes make sperm, the ovaries make eggs, fertilisation happens in the oviduct and implantation in the uterus, while the placenta and umbilical cord carry nutrients and oxygen; for cycle questions draw the days on one timeline and remember the fertile window runs about three days before and one day after ovulation.Tutor Registration →

Questions and answers are written originally by the TutorZone team and are not taken from any school, publisher or examination authority paper. Every value is checked by computer.