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SubjectsBiology
बांझपन और सहायक प्रजनन तकनीकें
This Class 12 Biology topic from Chapter 3, Reproductive Health, explains infertility as the persistent inability to achieve pregnancy and introduces medical approaches that may help some individuals or couples conceive. Students learn about causes affecting male and female reproductive systems, basic evaluation, and assisted reproductive technologies (ART) such as IVF, embryo transfer, ZIFT, GIFT and ICSI. The topic also develops an understanding of these procedures, their limitations, and the ethical, social and emotional considerations surrounding reproductive choices.
Correct answer: A. Because the cause may involve the male partner, the female partner, or both
Explanation: Infertility may result from factors affecting the male partner, the female partner, or both partners. Examining both partners supports a complete and accurate diagnosis. Blaming only one partner can overlook the actual medical cause and delay appropriate treatment.
Correct answer: A. Intracytoplasmic sperm injection (ICSI)
Explanation: In ICSI, one selected sperm is injected directly into the cytoplasm of an oocyte using micromanipulation. This makes ICSI suitable when sperm count or motility is very low. IVF-ET involves laboratory fertilisation, GIFT transfers gametes, and ZIFT transfers a zygote into the fallopian tube.
Correct answer: B. Uterus
Explanation: An embryo with more than eight blastomeres is transferred into the uterus by intrauterine transfer. The uterus provides the appropriate site for implantation and continued development, whereas a zygote or early embryo with up to eight blastomeres may be transferred to the fallopian tube during ZIFT.
Correct answer: A. In ZIFT, a zygote or early embryo with up to eight blastomeres is transferred into the fallopian tube, whereas in IUT, an embryo with more than eight blastomeres is transferred into the uterus.
Explanation: ZIFT involves transferring a zygote or early embryo with up to eight blastomeres into a fallopian tube. IUT involves transferring an embryo with more than eight blastomeres into the uterus. Therefore, option A correctly identifies both the developmental stage and the site of transfer; the other options reverse or misstate these details.
Correct answer: A. Female ova and male sperm
Explanation: The governing concept is the difference between gamete transfer and embryo transfer. In GIFT, collected ova and sperm are placed together into a fallopian tube, so fertilisation may occur inside the woman’s reproductive tract. A laboratory-formed zygote is associated with ZIFT, while an early embryo is used in embryo-transfer procedures. A fully developed foetus is never transferred in this technique. Therefore option A is correct.
Correct answer: A. A selected sperm is injected directly into the cytoplasm of an ovum using a fine needle.
Explanation: In ICSI, a single selected sperm is injected directly into the cytoplasm of an ovum using a fine needle. This differs from conventional IVF, in which sperm and ova are placed together in a laboratory dish and fertilisation occurs without direct sperm injection. Option C describes embryo transfer, while option D describes IUI.
Correct answer: A. To reduce the cervical barrier and allow more motile sperm to reach the oviduct
Explanation: IUI places washed and concentrated motile sperm beyond the cervix, reducing the cervical barrier and helping more sperm travel towards the oviduct and ovum. Fertilisation generally occurs in the oviduct rather than the uterus, and sperm motility remains important. Therefore, option A is correct.
Correct answer: A. Intrauterine insemination (IUI) — transfer of gametes into a fallopian tube
Explanation: In intrauterine insemination, processed semen is introduced into the uterus; gametes are not transferred into a fallopian tube. Therefore, option A is incorrectly matched. GIFT transfers gametes into a fallopian tube, IVF involves fertilisation outside the body, and ICSI directly injects one sperm into an ovum.
Correct answer: A. The cause should be diagnosed first, and simpler treatments may be considered before ART
Explanation: Infertility treatment depends on its underlying cause. Evaluation of both partners, counselling, and simpler cause-specific treatments are often considered first. ART is an advanced option for selected situations, but it does not permanently cure every type of infertility. The cause should be identified before an appropriate treatment is chosen.
Correct answer: A. Because infertility can affect a couple’s emotional well-being, relationships, and social life.
Explanation: Infertility can cause emotional stress, anxiety, stigma, social pressure, and difficulties within relationships. Social sensitivity encourages empathy, privacy, non-judgmental support, and appropriate counselling for both partners. It does not guarantee conception, and infertility may involve female factors, male factors, both partners, or unexplained causes.
