ART — IVF, ICSI, GIFT, ZIFT & Artificial Insemination

NCERT grounding

NCERT Class 12, Biology, Chapter 3 (§3.5 Infertility) is the anchor text. The chapter first defines infertility as inability to conceive after two years of unprotected sexual cohabitation, lists the causes (physical, congenital, disease, drugs, immunological, psychological), and notes that the male partner is responsible more often than not. Where corrective treatment is not possible, NCERT states the couple "could be assisted to have children through certain special techniques commonly known as assisted reproductive technologies (ART)". NIOS Biology, Lesson 21 (§21.3 New Medical Techniques in Reproduction) supplements the same content with a brief description of the test-tube baby procedure and artificial insemination.

"In vitro fertilisation (IVF — fertilisation outside the body in almost similar conditions as that in the body) followed by embryo transfer (ET) is one of such methods."

— NCERT Class 12, Biology, §3.5

ART techniques — definitions & flow

ART is an umbrella term. Under it, NCERT explicitly names six procedures, each with a specific abbreviation, indication and site of fertilisation. NEET questions almost always hinge on one of three discriminators: where the gametes meet (in the lab vs in the body), what is transferred (gametes, zygote or multi-cell embryo) and where the transferred material is placed (fallopian tube vs uterus). Treat the techniques as a decision tree, not a list.

IVF and embryo transfer (ZIFT, IUT)

IVF is the original ART workhorse. The protocol begins with controlled ovarian stimulation — the ovaries are hormonally driven to mature multiple follicles, the mature ova are aspirated, and sperms are collected from the husband or a healthy donor. Ova and sperms are then incubated together under simulated physiological conditions in the laboratory and induced to form a zygote. NCERT calls the procedure the "test tube baby programme", although the entire culture is in a glass dish, not a tube. The popular name has stuck and NEET uses it.

Once a zygote forms, it is allowed to cleave. What happens next defines the embryo transfer (ET) branch. If transfer is done while the embryo still has up to 8 blastomeres, it is placed in the fallopian tube and is called ZIFT (zygote intra fallopian transfer). If the embryo has progressed beyond 8 blastomeres, it is placed directly into the uterus and is called IUT (intra uterine transfer). NCERT also states that embryos formed by in vivo fertilisation can also be used for such transfer — i.e., ET is a transfer-side technique and does not insist that fertilisation must be in vitro.

GIFT — gamete intra fallopian transfer

GIFT addresses a different bottleneck: the woman cannot produce a viable ovum, but her tract is healthy enough to support fertilisation and early development. Here, an ovum collected from a donor is transferred into the recipient's fallopian tube, where it can encounter and be fertilised by the husband's sperms in vivo. Note carefully that, despite the "G" in the acronym, NCERT only specifies transfer of an ovum from a donor (not pre-combined gametes) into the tube; the fertilisation that follows is internal. GIFT is therefore an ART procedure in which the laboratory does not host fertilisation at all.

ICSI — intra cytoplasmic sperm injection

ICSI is a specialised in vitro procedure used when sperm function is severely impaired and conventional IVF would fail. Under a micromanipulator, a single immobilised sperm is loaded into a fine injection pipette and directly injected through the zona pellucida and oolemma into the ooplasm. One ovum requires only one sperm — making ICSI the rescue technique for severe oligozoospermia, asthenozoospermia or obstructive azoospermia (where sperm are retrieved surgically). The embryo formed is then transferred via ZIFT or IUT depending on the blastomere stage.

Artificial insemination (AI / IUI)

AI is reserved for infertility cases where the male partner is unable to inseminate the female (e.g., impotence) or has very low sperm counts in the ejaculates. In this technique, semen collected either from the husband or a healthy donor is artificially introduced into the vagina or — more commonly — directly into the uterus, in which case it is called IUI (intra-uterine insemination). Fertilisation continues to occur in the female reproductive tract. AI bypasses obstacles to sperm deposition but does nothing to repair fertilisation defects, so it cannot rescue cases that require ICSI.

Donor gametes, embryos & surrogacy

NCERT explicitly allows ova "from wife/donor" and sperms "from husband/donor" in IVF, and refers to the GIFT procedure using a donor ovum. The framework therefore admits donor gametes — and, by extension, donor embryos — as part of ART. NCERT also notes that embryos formed by in-vivo fertilisation can be transferred to assist females who cannot conceive. While NCERT does not develop surrogacy at length, the broader reproductive-health programme acknowledges gestational arrangements where the embryo of a couple is carried by another woman; the recurring theme is that ART must be paired with strong legal and ethical safeguards.

Ethical, legal & social concerns

NCERT closes §3.5 with a sober reflection on access and ethics. ART requires extremely high precision handling by specialised professionals and expensive instrumentation; the facilities are available in very few centres and remain affordable to only a limited number of people. Beyond cost, NCERT identifies emotional, religious and social factors as deterrents to adoption. Sex selection of embryos is prohibited (linked to the Pre-Conception and Pre-Natal Diagnostic Techniques Act, paired with the amniocentesis ban). NCERT then suggests that, given the many orphaned and destitute children in India, legal adoption is one of the best methods for couples looking for parenthood.

NEET 2025 (Q.170) directly tested this paragraph. The genuine drawbacks of IVF are: (B) expensive instruments and reagents, (D) less adoption of orphans, and (F) the possibility that the early embryo does not survive. The false claims to reject are: high fatality risk to mother, husband/wife necessarily being the donors, and unavailability in India — all of which NCERT contradicts directly.

Worked examples

Common confusion & NEET traps