CBSE Class 12 Biology Exemplar: Reproductive Health NCERT Solutions

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NCERT Solutions PDF Class 12 PDF

This chapter, "Reproductive Health," delves into crucial aspects of human reproduction and societal well-being. The NCERT Solutions provide detailed explanations for Multiple Choice Questions (MCQs) covering topics like assisted reproductive technologies (ART) such as ICSI, GIFT, ZIFT, and ET. It also addresses the impact of demographic factors like Infant Mortality Rate (IMR) and Maternal Mortality Rate (MMR) on population growth. The solutions explain natural contraceptive methods like lactational amenorrhea and discuss the reasons behind the reluctance to adopt sterilization techniques. Furthermore, it highlights the historical context of reproductive health programs in India, initiated in the 1950s. These solutions are designed to help students grasp complex concepts, understand the rationale behind different reproductive health strategies, and prepare effectively for their examinations by offering clear, step-by-step explanations.

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BoardCBSE
ClassClass 12
SubjectBiology Exemplar
Session2026
LanguageEnglish
TypeNCERT Solutions
ChapterChapter 4

Chapter summary

Chapter 4, "Reproductive Health," focuses on key concepts related to population control, assisted reproductive technologies, and the importance of reproductive well-being. The NCERT Solutions cover MCQs that test understanding of methods like ICSI, GIFT, ZIFT, and ET, as well as the influence of IMR and MMR on population dynamics. It also explains natural birth control methods and the societal perceptions surrounding sterilization. The chapter emphasizes the historical implementation of reproductive health programs in India, starting from the 1950s.

Learning outcomes

  • Understand the principles and applications of assisted reproductive technologies (ART) like ICSI, GIFT, ZIFT, and ET.
  • Analyze the impact of Infant Mortality Rate (IMR) and Maternal Mortality Rate (MMR) on population growth.
  • Explain the mechanism of natural contraceptive methods, such as lactational amenorrhea.
  • Identify the reasons why sterilization is often considered a last resort for contraception.
  • Recall the timeline and objectives of national reproductive health programs in India.

Topics covered

Paper topics

  • Assisted Reproductive Technologies (ART)
  • ICSI
  • GIFT
  • ZIFT
  • Embryo Transfer (ET)
  • Infant Mortality Rate (IMR)
  • Maternal Mortality Rate (MMR)
  • Population Growth Rate
  • Natural Contraception
  • Lactational Amenorrhea
  • Sterilization Techniques
  • Reproductive Health Programs

Important topics

  • Assisted Reproductive Technologies (ART) and their procedures
  • Impact of IMR and MMR on population dynamics
  • Mechanisms of natural and surgical contraception
  • National reproductive health initiatives

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Questions and Solutions

Multiple Choice Questions (MCQs) - Q. 1

The method of directly injecting a sperm into an ovum in assisted reproductive technology is called:
  1. GIFT (Gamete Intra Fallopian Transfer)
  2. ZIFT (Zygote Intra Fallopian Transfer)
  3. ICSI (Intra Cytoplasmic Sperm Injection)
  4. ET (Embryo Transfer)
Solution: The correct option is (c) ICSI. Intra Cytoplasmic Sperm Injection (ICSI) is a specialized laboratory procedure where a single sperm is directly injected into the cytoplasm of an ovum to achieve fertilization. This technique is particularly useful in cases of severe male infertility. GIFT involves transferring a donor ovum into the Fallopian tube, ZIFT involves transferring a zygote (up to 8 blastomeres) into the Fallopian tube, and ET involves transferring an embryo into the uterus.

Multiple Choice Questions (MCQs) - Q. 2

What is the likely impact on the population growth rate if both the Infant Mortality Rate (IMR) increases and the Maternal Mortality Rate (MMR) decreases?
  1. It will cause a rapid increase in the growth rate.
  2. It will result in a decline in the growth rate.
  3. It will not cause a significant change in the growth rate.
  4. It will result in an explosive population increase.
Solution: The correct option is (c). Infant Mortality Rate (IMR) and Maternal Mortality Rate (MMR) are inversely related to population growth. An increase in IMR tends to decrease the population growth rate because more infants die before reaching reproductive age. Conversely, a decrease in MMR tends to increase the population growth rate as more mothers survive to potentially have more children. When IMR increases and MMR decreases simultaneously, these opposing effects can counteract each other, leading to no significant overall change in the population growth rate.

Multiple Choice Questions (MCQs) - Q. 3

Intensely lactating mothers do not generally conceive due to the:
  1. suppression of gonadotropins
  2. hypersecretion of gonadotropins
  3. suppression of gametic transport
  4. suppression of fertilisation
Solution: The correct option is (a). Lactational amenorrhea is a natural contraceptive method that relies on the suppression of ovulation during the period of intense breastfeeding following childbirth. This suppression occurs because prolactin, a hormone elevated during lactation, inhibits the secretion of Gonadotropin-Releasing Hormone (GnRH) from the hypothalamus. GnRH is crucial for stimulating the release of Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH) from the pituitary gland, which are necessary for ovulation. Therefore, the suppression of gonadotropins prevents ovulation and thus conception.

Multiple Choice Questions (MCQs) - Q. 4

Sterilisation techniques are generally foolproof methods of contraception with the least side effects. Yet, these are often considered the last option for couples because:
  1. It is almost irreversible.
  2. There is a misconception that it will reduce sexual urge/drive.
  3. It is a surgical procedure.
  4. There is a lack of sufficient facilities in many parts of the country.
Choose the correct option:
  1. I and II only
  2. II and III only
  3. II and IV only
  4. I, II, III and IV
Solution: The correct option is (d), encompassing all listed reasons. Sterilization methods, such as vasectomy in males and tubectomy in females, are surgical procedures designed to permanently prevent gamete transport, thereby stopping conception. Their effectiveness and low incidence of side effects make them highly reliable. However, they are often considered a last resort due to their near-irreversibility, which can be a concern for couples who might change their minds later. Additionally, societal misconceptions about reduced sexual urge and the practical challenges of accessing surgical facilities, especially in remote areas, contribute to their delayed adoption.

Multiple Choice Questions (MCQs) - Q. 5

A national-level approach to build up a reproductively healthy society was taken up in our country in:
  1. 1950s
  2. 1960s
  3. 1980s
  4. 1990s
Solution: The correct option is (a). India was one of the pioneering nations globally to implement comprehensive action plans and programs aimed at achieving total reproductive health as a societal objective. These initiatives, broadly termed 'family planning' programs, were launched in 1951. Over the subsequent decades, these programs have been periodically evaluated and refined to enhance public awareness regarding various aspects of reproduction and to provide necessary support and facilities for fostering a reproductively healthy society.

Common mistakes

  • Confusing the different types of assisted reproductive technologies (GIFT, ZIFT, ICSI, ET).
  • Misinterpreting the combined effects of increased IMR and decreased MMR on population growth rate.
  • Not fully understanding the hormonal basis of lactational amenorrhea as a contraceptive method.
  • Overlooking the societal and psychological factors that influence the adoption of sterilization.

Revision tips

  • Create flashcards for the different ART methods, noting their key differences.
  • Draw diagrams to illustrate the processes involved in GIFT, ZIFT, and ICSI.
  • Summarize the pros and cons of each contraceptive method discussed.
  • Review the historical context of reproductive health programs in India to understand their evolution.

Practice MCQs

Q1. Which assisted reproductive technology involves the direct injection of a sperm into an ovum in a laboratory setting?

Q2. What is the primary effect of increased Infant Mortality Rate (IMR) and decreased Maternal Mortality Rate (MMR) on population growth?

Q3. Intensely lactating mothers often do not conceive due to the suppression of which hormones?

Q4. Which of the following is a primary reason why sterilization techniques are often a last resort for couples?

Q5. India was among the first countries to launch national reproductive health programs, often referred to as 'family planning'. In which decade were these programs initiated?

Frequently asked questions

What is ICSI and how does it differ from other ARTs?

ICSI (Intra Cytoplasmic Sperm Injection) is an ART where a single sperm is directly injected into the ovum. This differs from GIFT (transferring gametes to Fallopian tube), ZIFT (transferring zygote to Fallopian tube), and ET (transferring embryo to uterus).

How does lactational amenorrhea prevent pregnancy?

During intense breastfeeding after childbirth, the hormone prolactin suppresses the release of gonadotropins (GnRH, FSH, LH), which inhibits ovulation, thus preventing pregnancy naturally.

Why are sterilization methods considered a last resort?

Sterilization techniques like vasectomy and tubectomy are surgical and generally irreversible. They are usually opted for by couples who have completed their family size and do not wish to have more children.

What was the main goal of the family planning programs initiated in India in the 1950s?

The primary goal was to build a reproductively healthy society by creating awareness about reproduction-related issues and providing facilities and support for family planning.

What is the significance of understanding IMR and MMR in population studies?

IMR and MMR are key indicators of a population's health and development. Changes in IMR and MMR significantly influence the population growth rate, with declining rates generally leading to population increase.

Important links

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