આ MCQ મોડ્યુલ આના પર આધારિત છે: Infertility
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Infertility
🎓 Class 12
Biology
CBSE
Theory
Ch 3 – Reproductive Health
⏱ ~14 min
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આ મૂલ્યાંકન આના પર આધારિત હશે: Infertility
મૂલ્યાંકન બનાવવામાં તેમની સામગ્રી સામેલ કરવા ચિત્રો, PDF અથવા Word દસ્તાવેજ અપલોડ કરો.
Infertility
4.5 Infertility
A large number of couples all over the world, including India, are infertile i.e., they are unable to produce children in spite of unprotected sexual co-habitation. The reasons for infertility could be many — physical, congenital, diseases, drugs, immunological or even psychological. Infertility may lie with the male, the female, or both partners.
Social impact. In India and many other societies, the female partner is often blamed for childlessness. This is unfair and often factually wrong — research shows that male-factor infertility accounts for roughly 40-50% of cases. Specialised health-care units called infertility clinics diagnose and treat such cases, and now Assisted Reproductive Technologies (ART) make parenthood possible for many.
4.5.1 Common Causes of Infertility
| Origin | Common causes |
|---|---|
| Male | Low sperm count (oligospermia) or no sperm (azoospermia); poor sperm motility; abnormal sperm shape; blocked vas deferens; varicocele; alcohol/drug abuse; certain infections. |
| Female | Failure of ovulation; blocked or scarred fallopian tubes (often due to PID after STDs); endometriosis; uterine fibroids; hormonal imbalance (PCOS); cervical factors. |
| Either / both | Infections (mumps, STDs); congenital abnormalities; advancing age; immunological causes (anti-sperm antibodies); psychological stress; environmental toxins / radiation. |
4.6 Assisted Reproductive Technologies (ART)
Couples that cannot conceive after standard treatment can be assisted to have children through certain special techniques commonly known as Assisted Reproductive Technologies (ART). These techniques include IVF, ZIFT, GIFT, ICSI, AI, etc. Each suits a specific cause of infertility.
IVF
In Vitro Fertilisation
"Test-tube baby" — fertilisation done in a lab dish; embryo transferred back to uterus.ET
Embryo Transfer
Embryo with up to 8 blastomeres → uterus (IUT); >8-cell embryo → fallopian tube.ZIFT
Zygote Intra-Fallopian Transfer
Zygote / early embryo (up to 8 cells) inserted into the fallopian tube.IUT
Intra-Uterine Transfer
Embryo with more than 8 blastomeres transferred into the uterus.GIFT
Gamete Intra-Fallopian Transfer
Ovum from a donor + male partner's sperm transferred into fallopian tube of a woman who cannot produce ova.ICSI
Intra-Cytoplasmic Sperm Injection
A single sperm directly injected into the cytoplasm of the ovum — for very low sperm count.AI
Artificial Insemination
Husband's or donor's semen artificially introduced into the vagina or uterus (IUI) of the female.4.6.1 In Vitro Fertilisation (IVF) — "Test-tube Baby" Programme
In this technique, popularly known as test-tube baby programme:
- Ova from the wife (or a donor female) and sperms from the husband (or a donor male) are collected.
- They are induced to form a zygote under simulated conditions in the laboratory (in vitro = "in glass").
- The zygote or early embryo (up to 8 blastomeres) is transferred into the fallopian tube — this is called ZIFT.
- An embryo with more than 8 blastomeres is transferred into the uterus — this is called IUT.
Embryos formed by in-vivo fertilisation (fusion of gametes within the female) can also be used for such transfer to assist those females who cannot conceive.
4.6.2 GIFT — Gamete Intra-Fallopian Transfer
Transfer of an ovum collected from a donor into the fallopian tube of another female who cannot produce one but can provide a suitable environment for fertilisation and further development. Sperms from the male partner are also placed there so fertilisation occurs naturally inside the body.
4.6.3 ICSI — Intra-Cytoplasmic Sperm Injection
Another specialised procedure to form an embryo in the laboratory in which a single sperm is directly injected into the cytoplasm of the ovum. Particularly useful when the male has very low sperm count or poor motility.
4.6.4 Artificial Insemination (AI / IUI)
The problem of inability of the male partner to inseminate the female (very low sperm count, low motility, etc.) is corrected by artificial insemination (AI). The semen collected either from the husband or a healthy donor is introduced either into the vagina or into the uterus (IUI — Intra-Uterine Insemination) of the female.
Why ART is socially complex. Although ART techniques can offer hope to infertile couples, they are complex, expensive, technologically demanding and require highly trained medical professionals and a sophisticated infrastructure. Hence, only some major cities offer such services. Adoption of orphan/destitute children is a valuable parallel option that solves childlessness and helps children in need at the same time.
4.6.5 Quick Comparison of ART Methods
| Technique | Site of fertilisation | What is transferred | Best for |
|---|---|---|---|
| IVF | Lab dish (in vitro) | Embryo | Tubal block, unexplained infertility |
| ZIFT | Lab dish, then in vivo | Zygote / ≤8-cell embryo into fallopian tube | Tube partially functional |
| IUT | Lab dish, then in vivo | >8-cell embryo into uterus | Standard IVF transfer |
| GIFT | In vivo (fallopian tube) | Donor ovum + male sperm into tube | Female cannot produce ova but tube works |
| ICSI | Lab dish | Embryo (1 sperm injected into ovum) | Severe male-factor infertility |
| AI / IUI | In vivo (vagina / uterus) | Semen | Low sperm count or inability to inseminate |
🎯 Interactive: Match the ART to the Cause
Pick the dominant infertility cause; the tool suggests an appropriate ART technique with a brief reason.
Suggested ART: —
Choose a cause to see suggestion.
Worked Example 1 L2 Understand
Q. Define infertility. List two male and two female causes.
Infertility is the inability of a couple to conceive after one to two years of unprotected sexual cohabitation.
Male causes: oligospermia (low sperm count); blocked vas deferens.
Female causes: blocked fallopian tubes (often after PID due to STDs); failure of ovulation (e.g., PCOS).
Male causes: oligospermia (low sperm count); blocked vas deferens.
Female causes: blocked fallopian tubes (often after PID due to STDs); failure of ovulation (e.g., PCOS).
Worked Example 2 L3 Apply
Q. Differentiate ZIFT from IUT.
ZIFT (Zygote Intra-Fallopian Transfer): Embryo with up to 8 blastomeres is transferred into the fallopian tube.
IUT (Intra-Uterine Transfer): Embryo with more than 8 blastomeres is transferred directly into the uterus.
Both follow IVF; choice depends on embryo's developmental stage and the patient's tubal condition.
IUT (Intra-Uterine Transfer): Embryo with more than 8 blastomeres is transferred directly into the uterus.
Both follow IVF; choice depends on embryo's developmental stage and the patient's tubal condition.
Worked Example 3 L4 Analyse
Q. A male's semen has very low sperm count. Which ART will be most useful and why?
ICSI (Intra-Cytoplasmic Sperm Injection) — because IVF or AI both rely on many sperms naturally fertilising an ovum. ICSI bypasses this problem: a single healthy sperm is selected and injected directly into the cytoplasm of the ovum, dramatically improving fertilisation success in severe male-factor infertility.
📐 Activity 4.4 — ART time-line research
Aim: Trace milestones of ART in India and the world.
Predict: How many years passed between the first IVF baby and India's first IVF baby?
- Research the year and place for: world's first test-tube baby; India's first test-tube baby; first ICSI baby; first IVF using frozen eggs.
- Plot them on a time-line in your notebook.
- Discuss: how have improvements in cell-culture and freezing made ART more accessible?
Typical observations: Louise Brown — world's first IVF baby — was born on 25 July 1978 (UK). India's first IVF baby (Durga, alias Kanupriya Agarwal) was also born in 1978 in Kolkata, just months after Louise Brown — pioneered by Dr. Subhas Mukhopadhyay. Refinements like ICSI (1992) and embryo freezing make ART safer and more accessible today.
📚 Competency-Based Questions
1. The transfer of an embryo with more than 8 blastomeres into the uterus is called: L1
Answer: (C) IUT. ZIFT is up-to-8-cell embryo into fallopian tube; IUT is >8-cell embryo into uterus.
2. State the full forms of IVF, ZIFT, GIFT, ICSI. L2
IVF — In Vitro Fertilisation.
ZIFT — Zygote Intra-Fallopian Transfer.
GIFT — Gamete Intra-Fallopian Transfer.
ICSI — Intra-Cytoplasmic Sperm Injection.
ZIFT — Zygote Intra-Fallopian Transfer.
GIFT — Gamete Intra-Fallopian Transfer.
ICSI — Intra-Cytoplasmic Sperm Injection.
3. A 30-year-old woman cannot produce ova but has healthy fallopian tubes and uterus. Suggest the most appropriate ART. L3
GIFT (Gamete Intra-Fallopian Transfer). A donor's ovum and the husband's sperms are placed in her fallopian tube, allowing fertilisation in vivo and natural development. Her healthy tube and uterus support the rest.
4. Why is ART out of reach for many infertile couples in India? Suggest one policy step. L4
Causes: ART is highly specialised, expensive, requires sophisticated lab/embryology infrastructure and skilled professionals — concentrated in metro hospitals. Suggested step: subsidised public-sector ART units in district hospitals, regulated standards (under the ART Act 2021) and insurance coverage to make services equitable.
5. Evaluate: "Adoption is a better solution than ART for infertile couples." L5
Both options have merit. Adoption simultaneously gives a parentless child a family — a strong social good — and is financially much less demanding than ART. ART allows a biological child, addressing the couple's specific fertility issue. The "better" choice depends on the couple's medical condition, financial means and personal values; the two are complementary, not in opposition. Counselling should present both fairly.
🧠 Assertion–Reason Questions
Choose: (A) Both true, R explains A. (B) Both true, R doesn't explain A. (C) A true, R false. (D) A false, R true.
A: ICSI helps couples with severe male-factor infertility.
R: A single sperm is injected directly into the cytoplasm of the ovum.
Answer: (A). Both true; R explains A — by-passing the need for many motile sperms.
A: In ZIFT, the embryo is transferred into the uterus.
R: In ZIFT, embryos with more than 8 blastomeres are transferred.
Answer: (D). A is FALSE — in ZIFT the early embryo (≤8 blastomeres) is placed in the fallopian tube, not the uterus. R is also FALSE for ZIFT — the >8-cell stage is for IUT. Best matching choice: (D), as A is false.
A: Adoption is a useful alternative to ART for many couples.
R: ART is technically demanding and expensive; adoption gives a child a loving family.
Answer: (A). Both true; R explains A — pragmatic and humane reasons make adoption a strong alternative.
Frequently Asked Questions - Infertility
What is the main concept covered in Infertility?
In NCERT Class 12 Biology Chapter on Reproductive Health, "Infertility" covers the core biological structures, processes, and pathways students need for board exam success. The MyAiSchool lesson explains the topic with definitions, labelled diagrams, comparison tables, and interactive simulations. Scientific terminology and physiological/genetic significance are highlighted throughout to build conceptual depth aligned with CBSE 2025-26 syllabus.
How is Infertility useful in real-life or applied biology?
Real-life applications of "Infertility" from NCERT Class 12 Biology Reproductive Health include medical diagnostics, agriculture, biotechnology, public health, evolutionary insights, and ecological monitoring. The MyAiSchool lesson links every biological concept to a tangible application so students see biology as a problem-solving framework for living systems and real-world challenges.
What are the key terms students should memorize for Infertility?
Key terms in "Infertility" (NCERT Class 12 Biology Reproductive Health) are tabulated in the MyAiSchool key-terms grid. Students should memorize each term with its precise definition, function, and example. Terminology is high-yield in CBSE board exams — 1-mark MCQs and 2-mark short answers test definitions directly. The Summary section provides a printable quick-reference card.
How does this part connect to other parts of the chapter?
NCERT Class 12 Biology Reproductive Health is structured so each part builds biological understanding sequentially. "Infertility" connects to neighbouring parts via shared mechanisms, structural hierarchies, and physiological processes. The MyAiSchool lesson cross-references related concepts with internal links so students can navigate the whole chapter as one connected biological story rather than disconnected fragments.
What types of CBSE board questions come from Infertility?
CBSE board questions from "Infertility" typically include: (1) 1-mark MCQs on definitions and processes, (2) 2-mark short-answer differences/comparisons, (3) 3-mark labelled-diagram questions, (4) 5-mark long-answer essays combining mechanism + diagram + significance. The MyAiSchool lesson tags each Competency-Based Question (CBQ) with Bloom level (L1-L6) so students know how to study for each weight.
How can students use the interactive simulation effectively?
The interactive simulation in the "Infertility" lesson allows students to explore biological processes, classifications, or pathways using selectors and sliders, with live visual feedback. To use it effectively: (1) explore each option/state, (2) compare with textbook diagrams, (3) note the function/outcome changes, (4) try the integrated practice quiz. The simulation reinforces visual-spatial understanding that pure text-based study cannot.
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