Reproductive Health ISC Class 12 Biology: Notes and Questions

What Reproductive Health is about

Weightage: Reproductive Health is part of the unit Reproduction, which carries 16 of the 70 marks in the ISC Biology Paper 1 (Theory), shared with 2 other chapters. Questions on it can appear in any section of the paper.Source: CISCE ISC Biology syllabus, examination year 2027, distribution of marks

Key concepts

Reproductive health and RCH programmes

Reproductive health: total well-being in physical, emotional, behavioural and social aspects of reproduction (WHO). Programmes: India was among the first countries (1951) to begin national family planning programmes; these were widened into Reproductive and Child Health Care (RCH) programmes. Aims and actions: creating awareness about reproduction-related aspects through audio-visual and print media; sex education in schools to give correct information and discourage myths; educating couples about birth control, care of pregnant women, post-natal care of mother and child, breastfeeding, and equal opportunities for male and female children; awareness of problems due to uncontrolled population growth and sex abuse; providing medical facilities and care for problems such as pregnancy, delivery, STDs, abortion, contraception, menstrual problems and infertility. Successes: lower maternal and infant mortality, more institutional deliveries, better awareness, small family norms. Statutory ban on amniocentesis for sex determination to curb female foeticide; massive child immunisation.

Worked example

Give two reasons why sex education should be introduced in schools.

Try it first, then show the solutionSolution

1. It gives correct, age-appropriate information, removing myths and misconceptions about sex-related aspects.
2. It creates awareness of STDs, safe practices and problems of adolescence, so young people make responsible choices.

Answer: Correct information; awareness and protection

Population explosion and the role of government

World population grew from about 2 billion in 1900 to over 8 billion; India's from about 350 million at independence to over 1.4 billion. Causes: rapid decline in death rate, maternal mortality rate (MMR) and infant mortality rate (IMR) due to better medical facilities and living conditions, and an increase in the number of people of reproductive age, while birth rates fell more slowly. Consequences: scarcity of food, shelter, clothing and basic needs, pressure on resources and environment, unemployment. Measures by government: promoting small families (slogans such as 'Hum Do Hamare Do'), raising the legal marriageable age to 18 years for women and 21 years for men, incentives to couples with small families, wide availability of contraceptives, motivation through media. Growth rate = (birth rate − death rate); a positive difference means increase.

Worked example

Suppose a town of 20 000 people has 600 births and 200 deaths in a year. Find the birth rate, death rate and growth rate per 1000.

Try it first, then show the solutionSolution

1. Birth rate = 600/20 000 × 1000 = 30 per 1000; death rate = 200/20 000 × 1000 = 10 per 1000.
2. Growth rate = 30 − 10 = 20 per 1000 per year (2%).

Answer: 30, 10 and 20 per 1000 (2% per year)

Natural contraceptive methods

They avoid meeting of ovum and sperm without devices or drugs. Periodic abstinence (rhythm method): couples avoid coitus from about day 10 to day 17 of the cycle, when ovulation is expected and fertilisation is most likely (the fertile period). Withdrawal (coitus interruptus): the male withdraws his penis before ejaculation so semen is not deposited in the vagina. Lactational amenorrhoea: absence of menstruation during intense breastfeeding after delivery; ovulation and menstrual cycles do not occur because suckling keeps prolactin high, which suppresses GnRH and gonadotropins. It is effective only up to about six months after parturition and only with full breastfeeding. Advantages: no side effects, no cost. Disadvantage: high failure rate (sperm in pre-ejaculate; irregular ovulation).

Worked example

Why is lactational amenorrhoea considered a natural contraceptive, and what is its limitation?

Try it first, then show the solutionSolution

1. Frequent suckling keeps prolactin high, suppressing GnRH, LH and FSH, so ovulation does not occur and fertilisation cannot happen.
2. It works only during intense, full breastfeeding and only up to about six months after delivery.

Answer: Prolactin blocks ovulation; reliable only up to about six months

Barrier methods and intrauterine devices

Barriers prevent sperm and ovum from meeting. Condoms (thin rubber/latex sheaths) for males (cover the penis) and females (cover the vagina and cervix); they also protect against STDs and AIDS; disposable and self-inserted. Diaphragms, cervical caps and vaults (rubber) are inserted to cover the cervix; reusable; often used with spermicidal creams, jellies and foams to increase effectiveness. Intrauterine devices (IUDs), inserted by doctors or trained nurses into the uterus: non-medicated IUDs (Lippes loop), copper-releasing IUDs (CuT, Cu7, Multiload 375) and hormone-releasing IUDs (Progestasert, LNG-20). Mode of action: IUDs increase phagocytosis of sperms within the uterus; Cu ions released suppress sperm motility and fertilising capacity; hormone-releasing IUDs make the uterus unsuitable for implantation and the cervix hostile to sperms. IUDs are ideal for women who want to delay pregnancy or space children; they do not protect against STDs.

Worked example

One woman uses a Lippes loop and another a CuT. Compare how the two devices prevent pregnancy.

Try it first, then show the solutionSolution

1. Both are IUDs placed in the uterus; both increase phagocytosis of sperms within the uterus.
2. The Lippes loop is non-medicated and acts only in this way; the CuT also releases Cu ions, which suppress sperm motility and fertilising capacity, so it is more effective.

Answer: Both raise phagocytosis of sperms; only the CuT adds Cu ions that reduce sperm motility

Hormonal methods, emergency contraception and surgical methods

Oral pills: small doses of progestogens or progestogen-oestrogen combinations taken daily for 21 days, starting within the first five days of the cycle; after a 7-day gap (menstruation) the course repeats. They inhibit ovulation and implantation and alter the quality of cervical mucus to prevent entry of sperms. Saheli, a once-a-week non-steroidal pill developed by CDRI, Lucknow, has few side effects and high contraceptive value. Injections and implants (under the skin) of progestogens alone or with oestrogen act like pills for longer periods. Emergency contraception: progestogens or progestogen-oestrogen combinations, or an IUD, within 72 hours of coitus (rape, casual unprotected intercourse). Surgical methods (sterilisation): terminal and practically irreversible. Vasectomy (male): a small part of the vas deferens is removed or tied through a small incision on the scrotum. Tubectomy (female): a small part of the fallopian tube is removed or tied through a small incision in the abdomen or through the vagina. They block gamete transport. Side effects of some methods: nausea, abdominal pain, breakthrough bleeding, irregular bleeding.

Worked example

How do oral contraceptive pills prevent pregnancy? Name a non-steroidal pill.

Try it first, then show the solutionSolution

1. Progestogens (with oestrogens) inhibit ovulation and implantation, and make cervical mucus thick so sperms cannot enter.
2. Saheli, taken once a week.

Answer: Block ovulation and implantation, hostile cervical mucus; Saheli

Medical termination of pregnancy and amniocentesis

MTP (induced abortion): intentional or voluntary termination of pregnancy before full term. About 45-50 million MTPs occur worldwide each year. India legalised MTP in 1971 with strict conditions to prevent misuse (such as female foeticide); the MTP (Amendment) Act, 2017 (and its later amendment) lays down conditions. Reasons: to avoid unwanted pregnancy due to casual intercourse or failure of contraception, or after rape; when continuing the pregnancy could harm the mother or foetus (foetal abnormalities). MTPs are relatively safe during the first trimester (up to 12 weeks); second-trimester abortions are riskier. Misuse (illegal, unqualified practitioners, sex-selective abortion) is dangerous and unlawful. Amniocentesis: a foetal sex and disorder test in which a little amniotic fluid is drawn with a needle (about 14-16 weeks) and the foetal cells in it are cultured and their chromosomes examined. It detects chromosomal abnormalities (Down's syndrome, Turner's, Klinefelter's) and some metabolic and genetic disorders. Its misuse for sex determination leading to female foeticide is banned by law in India.

Worked example

Why is amniocentesis carried out only after about the fourteenth week of pregnancy, and why may it not be used to find the sex of the foetus?

Try it first, then show the solutionSolution

1. By then there is enough amniotic fluid, containing shed foetal cells, to withdraw safely; the cells are cultured and their chromosomes examined.
2. Its use for sex determination led to female foeticide and is banned by law in India; it is allowed only to detect disorders such as Down's syndrome.

Answer: Enough fluid and foetal cells by then; sex determination is legally banned to prevent female foeticide

Sexually transmitted diseases (STDs)

STDs (venereal diseases, reproductive tract infections) spread through sexual contact; some (hepatitis B, HIV) also spread by sharing injection needles, transfusion of infected blood, surgical instruments, and from mother to foetus. Examples by causative agent: bacterial: gonorrhoea (Neisseria gonorrhoeae), syphilis (Treponema pallidum), chlamydiasis (Chlamydia trachomatis); viral: genital herpes (Herpes simplex virus), genital warts (human papillomavirus, HPV), hepatitis B (hepatitis B virus), AIDS (HIV); protozoal: trichomoniasis (Trichomonas vaginalis). Symptoms (early): itching, fluid discharge, slight pain, swellings in the genital region; women may show no symptoms. Complications if untreated: pelvic inflammatory disease, abortions, still births, ectopic pregnancy, infertility, cancer of the reproductive tract. Except hepatitis B, genital herpes and HIV, all are completely curable if detected early and treated properly. Prevention: avoid sex with unknown partners or multiple partners; always use condoms during coitus; get medical help early if in doubt; use sterilised needles and screened blood. Note: IUDs, oral pills and surgical methods do not protect against STDs.

Worked example

Why do many women with an STD remain untreated for a long time, and what can happen if the infection is not treated?

Try it first, then show the solutionSolution

1. Early symptoms (itching, discharge, slight pain) are mild, and in women may be absent altogether; social stigma also delays testing.
2. Untreated STDs can cause pelvic inflammatory disease, abortions, still births, ectopic pregnancy, infertility or cancer of the reproductive tract.

Answer: Mild or absent early symptoms and stigma; PID, ectopic pregnancy and infertility can follow

Infertility and assisted reproductive technologies

Infertility: inability to conceive or produce children despite unprotected sexual cohabitation (usually for two years). Causes: physical, congenital, diseases, drugs, immunological or psychological; may lie in the male (low sperm count, poor motility, blocked ducts) or the female (blocked oviducts, ovulation failure, uterine problems). Specialised health care units (infertility clinics) can diagnose and treat many disorders. ARTs (definition and application only): IVF (in vitro fertilisation, 'test tube baby'): ova from the wife or donor and sperms from the husband or donor are fused in the laboratory under simulated conditions; followed by embryo transfer (ET). ZIFT (zygote intra-fallopian transfer): the zygote or early embryo (up to 8 blastomeres) is transferred into the fallopian tube. IUT (intra-uterine transfer): embryos with more than 8 blastomeres are transferred into the uterus. GIFT (gamete intra-fallopian transfer): an ovum from a donor is transferred into the fallopian tube of a female who cannot produce ova but can provide a suitable environment for fertilisation and development. ICSI (intracytoplasmic sperm injection): a sperm is directly injected into the ovum in the laboratory to form an embryo (for very low sperm counts). AI (artificial insemination): semen from the husband or a donor is introduced artificially into the vagina or uterus; used when the male cannot inseminate or has a low sperm count. IUI (intra-uterine insemination): AI in which semen is placed directly into the uterus. Constraints: specialised professionals, expensive equipment, emotional, religious and social factors; legal adoption is an alternative.

Worked example

A woman cannot produce ova but her oviducts and uterus are healthy. Which ART suits her? Which suits a man with an extremely low sperm count?

Try it first, then show the solutionSolution

1. GIFT: a donor ovum is transferred into her fallopian tube, where fertilisation occurs naturally.
2. ICSI: a single sperm is injected directly into an ovum in the laboratory (or AI/IUI with concentrated semen).

Answer: GIFT; ICSI

Reproductive Health in real life

Each concept, met in an everyday situation. Read the situation, answer the question in your own words, then compare with the model answer. The one-line hook is what to remember.

Topics in this chapter

• Sexually Transmitted Diseases
• Contraceptive Methods
• MTP and Amniocentesis

Reproductive Health: key facts

Growth rate

$\text{growth rate}=\text{birth rate}-\text{death rate}$

Per 1000 per year.

Fertile period (28-day cycle)

$\text{days }10\text{ to }17\text{ (ovulation about day 14)}$

Avoided in periodic abstinence.

Emergency contraception window

$\le 72\text{hours after coitus}$

Pills or IUD.

ZIFT vs IUT

$\text{embryo}\le 8\text{blastomeres}\to \text{fallopian tube (ZIFT)};>8\text{blastomeres}\to \text{uterus (IUT)}$

Both follow IVF.

Legal marriage age in India

$\text{female}\ge 18\text{years},\text{male}\ge 21\text{years}$

Measure to slow population growth.

Safe period for MTP

$\text{first trimester (up to 12 weeks)}$

Second-trimester MTP is riskier.

Reproductive Health: diagrams to practise

Practise each one on paper: draw it from the checklist, then tick off every label.

How the board asks Reproductive Health

The question patterns to expect, and the method that works for each.

Tricks to remember Reproductive Health

Short memory aids. Say each one aloud once, then use it on a question the same day.

• Copper names: Cu-T, Cu-7, Multiload 375

  Three-seven-five: the Multiload number.

  Use it when: Naming Cu-IUDs.

• G for Gamete, Z for Zygote

  GIFT moves a gamete (ovum); ZIFT moves a zygote; IUT moves an embryo of more than 8 cells to the uterus.

  Use it when: ART definitions.

• Bacteria GSC, Virus HHHW, Protozoa T

  Gonorrhoea, Syphilis, Chlamydiasis; Herpes, HIV, Hepatitis B, Warts; Trichomoniasis.

  Use it when: Classifying STDs.

• 72-hour rule

  Emergency contraception works within three days.

  Use it when: Emergency contraceptives.

• Snip the tube

  Vasectomy cuts vas deferens; tubectomy cuts fallopian tubes.

  Use it when: Surgical methods.

Reproductive Health: board-level solved questions

Ordered from board level to HOTS. Cover the solution, write your own, then compare step by step.

Case-study practice (Section D style)

Read the situation, then answer every part. In the board paper this is a 5-mark question split into 1 + 1 + 1 + 2 marks.

Where the marks are

How a typical answer is split into step marks. Show every step: a right final answer alone rarely earns full marks.

Where students lose marks in Reproductive Health

The slips examiners see most often, and what to write instead.

• ✗Mistake: Incomplete or wrong IUD answers

  CISCE examiners' comments, 2024: candidates named only one Cu-releasing IUD, wrote Multiload 365 instead of 375, and described the action of barrier methods instead of Cu-releasing IUDs.

  Wrong working

  Cu-T; it blocks the sperms from entering.

  Right working

  CuT and Multiload 375; Cu ions suppress sperm motility and fertilising capacity; phagocytosis of sperms increases.

  ✓Do this: Give two named devices and two actions when two are asked.

  Usually costs: 1 mark each.

• ✗Mistake: Misspelling or misnaming amniocentesis

  CISCE examiners' comments, 2025: candidates misspelt amniocentesis (aminocentesis, amniosynthesis, aminocentisis) or wrote unrelated terms such as pedigree analysis, genetic counselling or blood test.

  Wrong working

  Aminocentesis / pedigree analysis.

  Right working

  Amniocentesis.

  ✓Do this: Remember 'amnio' (amnion) + 'centesis' (puncture).

  Usually costs: 1 mark.

• ✗Mistake: Repeating the statement instead of giving the reason

  CISCE examiners' comments, 2025: for lactational amenorrhoea, candidates restated that menstruation is absent without linking it to suppression of ovulation by high prolactin during breastfeeding.

  Wrong working

  Menstruation is absent because there is no menstruation during lactation.

  Right working

  High prolactin during breastfeeding suppresses ovulation, so no menstrual cycle occurs.

  ✓Do this: Every 'give a reason' answer needs a cause (here, a hormone).

  Usually costs: 1 mark.

• ✗Mistake: Listing non-STDs and wrong protective methods

  CISCE examiners' comments, 2025: candidates gave causative agents or non-STD diseases (cholera, pneumonia, common cold, influenza, amoebiasis) as STDs, and listed IUDs, Lippes loop, Cu-T, oral pills or surgical methods as preventing STDs.

  Wrong working

  Protozoal STD: amoebiasis; Cu-T prevents STDs.

  Right working

  Protozoal STD: trichomoniasis; only condoms (male and female) also prevent STDs.

  ✓Do this: Learn the STD list by cause; barrier = protection.

  Usually costs: 1-2 marks.

Practice questions on Reproductive Health

Write each answer on paper first. Open the hint only if you are stuck, and the answer only when you have finished.

1. Q1 · 1 mark · MCQBoard level

   Saheli is:
   (a) a copper IUD
   (b) a once-a-week non-steroidal oral pill
   (c) a female condom
   (d) a surgical method

   Hint

   CDRI, Lucknow.

   Answer

   (b)

2. Q2 · 1 mark · MCQBoard level

   Which STD is caused by a protozoan?
   (a) syphilis
   (b) trichomoniasis
   (c) genital warts
   (d) gonorrhoea

   Hint

   Trichomonas.

   Answer

   (b)

3. Q3 · 1 mark · Assertion-reasonBoard level

   Assertion: Vasectomy does not affect male secondary sexual characters.
   Reason: Only the vas deferens is cut; testosterone secretion by Leydig cells continues.
   (a) Both true, Reason explains Assertion
   (b) Both true, Reason does not explain
   (c) Assertion true, Reason false
   (d) Both false

   Hint

   Hormones enter blood directly.

   Answer

   (a)

4. Q4 · 1 mark · Very short answerBoard level

   Name the ART in which a sperm is directly injected into the ovum.

   Hint

   Intracytoplasmic.

   Answer

   ICSI

5. Q5 · 1 mark · Very short answerBoard level

   Which STDs are not completely curable?

   Hint

   Three viral.

   Answer

   Hepatitis B, genital herpes and HIV infection (AIDS).

6. Q6 · 2 marks · Short answerHarder board level

   Give two complications of untreated STDs.

   Hint

   Reproductive outcomes.

   Answer

   Pelvic inflammatory disease, abortions, still births, ectopic pregnancy, infertility or reproductive tract cancer (any two).

7. Q7 · 2 marks · Short answerHarder board level

   Why are hormone-releasing IUDs and pills described as acting on both ovulation and implantation?

   Hint

   Progestogen effects.

   Answer

   Progestogens suppress gonadotropins (blocking ovulation) and change the endometrium so it is unsuitable for implantation; they also thicken cervical mucus.

8. Q8 · 2 marks · Short answerHarder board level

   Explain the difference between AI and IUI, and when AI is used.

   Hint

   Where semen is placed.

   Answer

   AI: semen from husband or donor introduced artificially into the female tract (vagina or uterus). IUI: a form of AI where semen is placed directly into the uterus. Used when the male cannot inseminate or has a low sperm count.

9. Q9 · 2 marks · Short answerHarder board level

   In a town of 40 000 people, there were 1000 births and 360 deaths in a year. Calculate the growth rate per 1000 and the expected population after one year.

   Hint

   (B − D)/N.

   Answer

   Birth rate 25, death rate 9 per 1000; growth rate 16 per 1000. Population after one year = 40 000 + 640 = 40 640.

10. Q10 · 2 marks · Short answerBoard level

    Give three features of an ideal contraceptive.

    Hint

    User-friendly.

    Answer

    User-friendly, easily available, effective and reversible, with no or minimal side effects, and not interfering with sexual drive or desire.

11. Q11 · 5 marks · Long answerHarder board level

    (a) What is meant by reproductive health? [1]
    (b) Explain four aims of the RCH programmes. [2]
    (c) Give two measures that helped reduce MMR and IMR, and explain how this contributed to the population explosion. [2]

    Hint

    WHO definition.

    Answer

    (a) Total well-being in physical, emotional, behavioural and social aspects of reproduction. (b) Awareness through media; sex education; educating couples on birth control, prenatal and post-natal care, breastfeeding; providing medical help for STDs, infertility, safe delivery. (c) Institutional deliveries and immunisation/better medical care; fewer deaths of mothers and infants while birth rates stayed high increased the growth rate.

12. Q12 · 3 marks · Short answerHOTS / competency

    A newly married couple living in a village with no clinic nearby wants to delay their first child by two years. Evaluate periodic abstinence, withdrawal and condoms for them.

    Hint

    Effectiveness and access.

    Answer

    Periodic abstinence and withdrawal need no supplies but have high failure rates (irregular ovulation; sperm in pre-ejaculate). Condoms are cheap, reversible, need no clinic, are more reliable if used correctly, and also prevent STDs: the best choice here.

13. Q13 · 2 marks · Short answerHOTS / competency

    Why is amniocentesis useful for a couple with a family history of a chromosomal disorder, and why is it legally banned for sex determination?

    Hint

    Benefit vs misuse.

    Answer

    It reveals the foetal karyotype early so parents can make informed decisions (e.g. about MTP) for serious disorders. Its misuse to identify female foetuses for abortion led to female foeticide and an adverse sex ratio, so this use is banned.

Test your recall

Answer in your head or on paper first, then open the card. Pulling an answer out of memory makes it stick far better than re-reading.

1. 1.Define reproductive health.Show answer

   Total well-being in all aspects of reproduction: physical, emotional, behavioural and social.

2. 2.Name two hormone-releasing IUDs.Show answer

   Progestasert and LNG-20.

3. 3.What is vasectomy?Show answer

   Surgical sterilisation in which a part of the vas deferens is removed or tied.

4. 4.Within how many hours must emergency contraception be used?Show answer

   72 hours.

5. 5.Causative agent of syphilis?Show answer

   Treponema pallidum (a bacterium).

6. 6.What is GIFT?Show answer

   Transfer of an ovum from a donor into the fallopian tube of a woman who cannot produce ova.

7. 7.When was MTP legalised in India?Show answer

   1971.

8. 8.Legal marriageable ages in India?Show answer

   18 years for females, 21 years for males.

Quick revision checklist

The night before the exam: can you do each of these without looking?

• ☐Can you define reproductive health and list RCH aims?
• ☐Can you explain why population exploded after 1947?
• ☐Can you name three types of IUD with examples and actions?
• ☐Can you explain how pills and lactational amenorrhoea prevent pregnancy?
• ☐Can you state when MTP is safe and why it is regulated?
• ☐Can you describe amniocentesis and its misuse?
• ☐Can you classify eight STDs as bacterial, viral or protozoal?
• ☐Can you match IVF, ZIFT, IUT, GIFT, ICSI, AI and IUI to their definitions?

Reproductive Health: frequently asked questions