S3 Science: Human Reproduction And Puberty (Paper 2 (intermediate))

S3 Science: Human Reproduction and Puberty (Paper 2 (intermediate))

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 2 (intermediate))

This paper goes further into hormone and organ matching, the order of ducts sperm passes through, the luteal phase and cycle length, identical against fraternal twins, with calculations on cycles per year, the share of a year taken by 40 weeks and the gap between the period and ovulation.

Direct answers　The testes release testosterone and the ovaries oestrogen; sperm pass the sperm duct then the urethra; the luteal phase lasts about 14 days; a boy and a girl must be fraternal twins; birth at 32 weeks is 8 weeks early; 365 days holds about 13 cycles; 40 weeks is 76.9 per cent of a year; day 5 to ovulation on day 16 is 11 days; the organs exist at birth and mature at puberty.

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)

FoundationBesides making sperm, which hormone do the testes release?
FoundationWhich hormone do the ovaries mainly release?
FoundationWhich two tubes does sperm pass through on its way out of the body?
IntermediateIn a 28 day cycle with ovulation on day 14, how many days lie between ovulation and the next period?
IntermediateA twin pair of one boy and one girl is identical or fraternal?
IntermediateA pregnancy is 40 weeks. If a baby is born at 32 weeks, how many weeks early is that?
ChallengeWith a 28 day cycle and a 365 day year, roughly how many cycles are there?
ChallengeA pregnancy lasts 40 weeks and a year has 52 weeks. What percentage of a year is the pregnancy?
ChallengeIn a 30 day cycle the period runs from day 1 to day 5 and ovulation is on day 16. How many days lie between the end of the period and ovulation?
Error redoCommon error: the reproductive organs only grow at puberty. What is correct?

03　Answers and one-line notes

#	Answer	One-line note
1	Testosterone	Testosterone brings on secondary sexual characteristics such as a deeper voice, facial hair and more muscle.
2	Oestrogen	Oestrogen thickens the lining of the uterus and maintains female secondary sexual characteristics.
3	The sperm duct first, then the urethra	The urethra is shared by sperm and urine, but the two are not released at the same time.
4	14 days	The luteal phase is fairly steady at about 14 days, so cycle length varies mostly before ovulation.
5	Fraternal	Identical twins come from one zygote that splits, so their sex is the same; a boy and a girl must come from two eggs and two sperm.
6	8 weeks	40 minus 32 gives 8.
7	13 cycles	365 divided by 28 gives 13.04, which rounds down to 13 cycles.
8	76.9 per cent	40 divided by 52 times 100 gives 76.92, which is 76.9 to one decimal place.
9	11 days	16 minus 5 gives 11.
10	The organs are present at birth; puberty only matures them and starts gamete production	Puberty is when the organs become functional, not when they first form.

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.