BiologyISC Class 12 · Reproductive Health

MTP (Medical Termination of Pregnancy) and Amniocentesis: ISC Class 12

Updated 15 October 2026 · Fact-checked

Medical termination of pregnancy (MTP) is the intentional ending of a pregnancy before full term. It is relatively safe in the first trimester (up to 12 weeks) and is legal in India under strict conditions. Amniocentesis tests amniotic fluid for genetic disorders such as Down's syndrome; its use for sex determination is banned.

Understand MTP and Amniocentesis

Medical termination of pregnancy (MTP) or induced abortion is the intentional or voluntary termination of pregnancy before full term.

Scale. Nearly 45 to 50 million MTPs are performed in the world every year, about one-fifth of all conceived pregnancies. Whether to accept or legalise MTP is debated because of emotional, ethical, religious and social issues.

Reasons for MTP (ISC asks these).
1. To get rid of an unwanted pregnancy after casual unprotected intercourse or failure of the contraceptive used.
2. Pregnancy resulting from rape.
3. When continuing the pregnancy could be harmful or even fatal to the mother, the foetus or both, for example when the foetus has a serious abnormality.

Law in India. India legalised MTP in 1971, with strict conditions to prevent misuse, particularly indiscriminate and illegal female foeticide. NCERT describes the MTP (Amendment) Act, 2017, enacted to reduce illegal abortions and the resulting maternal deaths and illness:

Within the first 12 weeks: termination on the opinion of one registered medical practitioner (RMP).
From 12 to 24 weeks: two RMPs must be of the opinion, in good faith, that grounds exist.
Grounds: risk to the life of the pregnant woman or grave injury to her physical or mental health; or a substantial risk that the child, if born, would suffer such physical or mental abnormalities as to be seriously handicapped.

Safety. MTPs are relatively safe in the first trimester (up to 12 weeks); second-trimester abortions are much riskier.

Disturbing trends.

Most MTPs are done illegally by unqualified quacks: unsafe and possibly fatal.
Misuse of amniocentesis to find the sex of the foetus, followed by MTP if it is female: totally illegal.
Remedies: counselling on avoiding unprotected coitus, on the risks of illegal abortion, and more health-care facilities.

Amniocentesis. A prenatal diagnostic test. A little amniotic fluid surrounding the developing foetus is drawn and its fetal cells and dissolved substances are analysed.

Uses: to test for certain genetic disorders such as Down's syndrome, haemophilia and sickle-cell anaemia, and to judge the survivability of the foetus. Chromosomes of the cultured fetal cells reveal chromosomal disorders (karyotyping).
Why it matters: parents with a family history of a genetic disorder (for example a previous child with Down's syndrome) can learn whether the foetus is affected, and doctors can advise on management or, within the law, on MTP.
Misuse and ban: the same test can reveal the sex of the foetus. Because it was misused for sex-selective abortion of female foetuses, India imposed a statutory ban on amniocentesis for sex determination. It remains legal for detecting genetic disorders.

Flow chart: family history or risk → amniocentesis → fluid with fetal cells → culture and chromosome or chemical analysis → disorder detected or excluded → counselling.

Draw and label: amniocentesis. Checklist: uterus wall; foetus inside the amniotic cavity; amnion; placenta; needle (syringe) passing through the abdominal wall and uterus into the amniotic fluid; label amniotic fluid, fetal cells, ultrasound guide (optional).

MTP and Amniocentesis: key facts

Legal limits in NCERT's account of the Act: $\leq 12 weeks: one RMP; 12 - 24 weeks: two RMPs$; RMP = registered medical practitioner.
Scale of MTP: $45 - 50 million MTPs \approx \frac{1}{5} of conceived pregnancies \Rightarrow 225 - 250 million pregnancies a year$; NCERT gives the first two figures; the third follows.
Amniocentesis: $amniotic fluid \to fetal cells + dissolved substances \to genetic disorders, survivability$; Banned for sex determination.
Safety: $first trimester (to 12 weeks): relatively safe; second trimester: much riskier$; Illegal MTP by quacks is dangerous at any stage.

How to answer MTP and Amniocentesis questions

ISC asks you to define MTP and give reasons, explain why it is regulated, name the prenatal test for a genetic disorder, and explain the ban on its misuse.

1Define MTP in one line: intentional or voluntary termination of pregnancy before full term.
2For reasons, give three: unwanted pregnancy (contraceptive failure, casual intercourse), rape, risk to mother or foetus.
3For safety, quote 'relatively safe up to 12 weeks (first trimester)'; second trimester riskier.
4For a case with a previous child with a genetic disorder, name amniocentesis and spell it correctly.
5Explain the test: amniotic fluid → fetal cells and dissolved substances analysed → disorders such as Down's syndrome, haemophilia, sickle-cell anaemia.
6For ethics, link misuse of amniocentesis to female foeticide and the statutory ban.

MTP and Amniocentesis in real life

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

Prenatal diagnosis after a previous affected child

Suppose a couple's first child has Down's syndrome. In the next pregnancy they ask a gynaecologist whether the new baby will be affected, and a relative suggests also finding out whether it is a boy or a girl.

Name the test the doctor may advise, explain what it shows, and respond to the relative's suggestion.

Try it first, then show the solutionSolution

The doctor may advise amniocentesis: a little amniotic fluid around the foetus is drawn and the fetal cells and dissolved substances are analysed.
Down's syndrome is a chromosomal disorder (an extra chromosome 21), so the chromosomes of the cultured fetal cells show whether the foetus is affected.
If the foetus is affected, the couple can receive counselling; within the legal conditions MTP may be considered on the ground of serious abnormality.
Using the test to find the sex of the foetus is banned by law in India because it has been misused for female foeticide, so the doctor must refuse.

Answer: Amniocentesis detects chromosomal disorders such as Down's syndrome from fetal cells in amniotic fluid; using it to learn the sex of the foetus is illegal.

Memory hook: Amniocentesis checks health, not gender.

Tricks to remember MTP and Amniocentesis

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

Twelve is the safe line
First trimester = first 12 weeks = one doctor and relatively safe.
Use it when: Safety and legal-limit questions.
Amnio = Amniotic fluid
Amnio-CENTESIS: centesis means puncture; you puncture the amnion to sample amniotic fluid.
Use it when: Spelling and explaining the test.
U-R-R: why MTP
Unwanted (contraceptive failure), Rape, Risk to mother or foetus.
Use it when: Listing reasons for MTP.

MTP and Amniocentesis: solved examples

Ordered from board level to HOTS. Try each one before you open the solution.

Example 1: Defining MTP · 2 marks · Short answerBoard level

What is medical termination of pregnancy? Up to which stage is it considered relatively safe?

Try it first, then show the solutionSolution

MTP (induced abortion) is the intentional or voluntary termination of pregnancy before full term (1 mark).
It is relatively safe during the first trimester, up to 12 weeks of pregnancy (1 mark).

Answer: Intentional termination of pregnancy before full term; relatively safe up to 12 weeks.

Example 2: Naming the test · 2 marks · Short answerBoard level

Name the prenatal technique used to detect genetic disorders in a foetus and give two disorders it can reveal.

Try it first, then show the solutionSolution

Amniocentesis: analysis of fetal cells and dissolved substances in a sample of amniotic fluid (1 mark).
Down's syndrome, haemophilia, sickle-cell anaemia (any two) (1 mark).

Answer: Amniocentesis; Down's syndrome, haemophilia or sickle-cell anaemia.

Example 3: Reasons and risks · 3 marks · Short answerHarder board level

Give three reasons for which MTP may be needed, and two disturbing trends associated with it in India.

Try it first, then show the solutionSolution

Reasons: unwanted pregnancy due to casual unprotected intercourse or contraceptive failure; pregnancy due to rape; continuation harmful or fatal to the mother, foetus or both (1½ marks).
Trends: most MTPs are performed illegally by unqualified quacks, which is unsafe and can be fatal (¾ mark).
Misuse of amniocentesis to determine the sex of the foetus, followed by MTP of female foetuses (¾ mark).

Answer: Unwanted pregnancy, rape, risk to mother or foetus; illegal MTPs by quacks and sex-selective abortion after amniocentesis.

Example 4: The law in two stages · 3 marks · Short answerHarder board level

According to NCERT's account of the MTP (Amendment) Act, 2017, how does the requirement for a doctor's opinion differ for a pregnancy of 10 weeks and one of 18 weeks? State the two grounds on which termination is allowed.

Try it first, then show the solutionSolution

10 weeks (within the first 12): the opinion of one registered medical practitioner is enough (½ mark).
18 weeks (between 12 and 24): two registered medical practitioners must be of the opinion, in good faith, that grounds exist (1 mark).
Grounds: continuing the pregnancy risks the woman's life or grave injury to her physical or mental health; or there is a substantial risk that the child would be born with physical or mental abnormalities making it seriously handicapped (1½ marks).

Answer: One RMP up to 12 weeks, two RMPs from 12 to 24 weeks; grounds: risk to the woman, or serious abnormality in the child.

Example 5: One-fifth of pregnancies · 2 marks · Short answerHarder board level

NCERT states that 45-50 million MTPs a year are about one-fifth of all conceived pregnancies. (a) Estimate the number of pregnancies conceived worldwide each year. (b) Suggest two measures that would lower the number of MTPs without restricting legal access.

Try it first, then show the solutionSolution

(a) 45 × 5 = 225 million to 50 × 5 = 250 million pregnancies a year (1 mark).
(b) Better access to and awareness of contraceptives (fewer unwanted pregnancies); counselling and sex education about unprotected coitus (1 mark).

Answer: (a) About 225-250 million. (b) Wider contraceptive use and counselling or sex education.

Example 6: A test with two faces · 3 marks · Short answerHOTS / competency

Amniocentesis is both a valuable diagnostic test and a source of social harm. Explain both sides, and justify why the law bans one use but not the other.

Try it first, then show the solutionSolution

Value: analysing fetal cells and dissolved substances in amniotic fluid detects genetic disorders such as Down's syndrome, haemophilia and sickle-cell anaemia and tells doctors about the survivability of the foetus, allowing informed decisions (1 mark).
Harm: the same analysis reveals the sex of the foetus; it has been misused to abort female foetuses, worsening female foeticide and the sex ratio (1 mark).
The ban targets the purpose, not the technique: sex determination has no medical value for a healthy foetus and fuels discrimination, while disease detection protects mother and child (1 mark).

Answer: Useful for detecting genetic disorders; harmful when used for sex selection; the law bans sex determination while allowing diagnosis.

Where students lose marks in MTP and Amniocentesis

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

Mistake: Misspelling amniocentesis
In 2025 examiners reported spellings such as 'aminocentesis', 'amniosynthesis' and 'aminocentisis'.
Do this: Break it up: amnio-centesis (puncture of the amnion).
Usually costs: The 1-mark answer.
Mistake: Naming a vague or unrelated test
Examiners (2025) found pedigree analysis, genetic counselling, gynaecological tests or a blood test given for detecting a genetic abnormality in an embryo.
Do this: Name the specific prenatal test: amniocentesis (chorionic villi sampling and karyotyping were also accepted).
Usually costs: 1 mark.
Mistake: Saying amniocentesis is banned
Students over-extend the ban.
Wrong working
Amniocentesis is banned in India.
Right working
Amniocentesis for sex determination is banned; it is used legally to detect genetic disorders.
Do this: Always add 'for sex determination'.
Usually costs: 1 mark.
Mistake: Wrong safe period for MTP
Students confuse the 24-week legal limit with safety.
Do this: Relatively safe: first trimester (up to 12 weeks). 24 weeks is a legal limit in NCERT's account of the Act, not a safe limit.
Usually costs: ½ to 1 mark.

Exam tips

Use NCERT's figures: 45-50 million, one-fifth, 1971, 12 weeks, 12-24 weeks.
Write the full term 'medical termination of pregnancy' once, then MTP.
Name disorders detected by amniocentesis: Down's syndrome, haemophilia, sickle-cell anaemia.
For ethics questions, present both sides and end with what the law allows.
Link female foeticide to misuse of amniocentesis in every answer on the ban.

Practice questions on MTP and Amniocentesis

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

Q1 · 1 mark · MCQBoard level
In which year did the Government of India legalise MTP?
(a) 1951 (b) 1971 (c) 1981 (d) 2017
Hint
1951 began family planning; 2017 is the amendment.
Answer
(b) 1971.
Q2 · 2 marks · Short answerBoard level
What is analysed in amniocentesis, and from where is the sample taken?
Hint
Fluid around the foetus.
Answer
A small amount of amniotic fluid, which surrounds the developing foetus inside the amnion, is taken; the fetal cells and dissolved substances in it are analysed.
Q3 · 1 mark · Assertion-reasonHarder board level
Assertion (A): Second-trimester MTPs are preferred because the foetus is larger and easier to remove.
Reason (R): MTPs are relatively safe up to 12 weeks of pregnancy.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Hint
Which trimester is riskier?
Answer
(d). Second-trimester abortions are much riskier; MTPs are relatively safe in the first trimester.
Q4 · 2 marks · Short answerHarder board level
Why is a statutory ban on amniocentesis for sex determination necessary in India?
Hint
What often follows if the foetus is female?
Answer
Amniocentesis reveals the sex of the foetus, and it has been misused to identify female foetuses, which are then aborted. The ban legally checks this female foeticide, which is reported to be high in India.
Q5 · 2 marks · Short answerHarder board level
Why do strict conditions accompany the legalisation of MTP? Give two reasons.
Hint
Misuse and safety.
Answer
To prevent misuse, especially indiscriminate and illegal female foeticide; and to make sure abortions are done by qualified practitioners on valid grounds, reducing unsafe illegal abortions and the maternal deaths and illness they cause.
Q6 · 2 marks · Short answerHarder board level
Give two reasons why MTP is being debated in many countries, and one way in which illegal MTPs can be reduced.
Hint
Kinds of issues involved.
Answer
Emotional, ethical, religious and social issues are involved (any two). Illegal MTPs can be reduced by counselling on avoiding unprotected coitus and on the risks of illegal abortions, and by providing more health-care facilities.
Q7 · 3 marks · Short answerHOTS / competency
Suppose amniocentesis shows that a foetus has a severe abnormality at 20 weeks of pregnancy. (a) Under NCERT's account of the MTP (Amendment) Act, 2017, may the pregnancy be terminated, and what is required? (b) Why is it riskier than an MTP at 10 weeks? (c) Give one argument a counsellor might raise for each side in such a decision.
Hint
12-24 weeks; second trimester.
Answer
(a) Yes, on the ground of a substantial risk of serious handicap, provided two registered medical practitioners agree in good faith (it is between 12 and 24 weeks). (b) It is a second-trimester abortion, which is much riskier than one in the first trimester. (c) For: preventing suffering of a seriously handicapped child and protecting the family's and mother's well-being. Against: ethical or religious belief in the value of the foetus's life, and possible support available for the child.
Q8 · 3 marks · Case-basedHOTS / competency
Read and answer.
Suppose a district reports a falling number of girls per 1000 boys among newborns. Investigators find unregistered clinics offering 'gender tests' in pregnancy, and several women admitted with complications after abortions by untrained persons.
(a) Which test is probably being misused? (1)
(b) Name two dangerous trends shown in the passage. (1)
(c) Suggest two actions the authorities should take. (1)
Hint
Sex ratio; quacks.
Answer
(a) Amniocentesis (or other prenatal tests) used for sex determination. (b) Misuse of prenatal tests for sex determination followed by abortion of female foetuses; illegal MTPs by unqualified persons. (c) Enforce the statutory ban and close illegal clinics; provide safe legal MTP facilities, counselling and awareness.

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.What fraction of conceived pregnancies end in MTP each year worldwide?Show answer
About one-fifth.
2.Up to how many weeks is MTP considered relatively safe?Show answer
12 weeks (first trimester).
3.What is sampled in amniocentesis?Show answer
Amniotic fluid containing fetal cells and dissolved substances.
4.Name a chromosomal disorder detected by amniocentesis.Show answer
Down's syndrome.
5.How many registered medical practitioners must agree for an MTP between 12 and 24 weeks (NCERT's account of the 2017 Act)?Show answer
Two.
6.What is another name for MTP?Show answer
Induced abortion.

MTP and Amniocentesis: frequently asked questions

What is MTP?

Medical termination of pregnancy: the intentional or voluntary termination of pregnancy before full term, also called induced abortion.

Why is MTP done?

To end unwanted pregnancies from contraceptive failure, casual unprotected intercourse or rape, or when continuing the pregnancy could harm or kill the mother or foetus.

What is amniocentesis used for?

To analyse fetal cells and substances in amniotic fluid for genetic disorders such as Down's syndrome, haemophilia and sickle-cell anaemia, and to judge survivability of the foetus.

Why is amniocentesis for sex determination banned?

Because it was misused to identify and abort female foetuses, leading to female foeticide.

When is MTP safest?

In the first trimester, up to 12 weeks of pregnancy; second-trimester abortions are much riskier.