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Q1. Birth of the baby occurs due to:
Childbirth (parturition) is triggered by rhythmic, strong contractions of the uterine muscles. These contractions dilate the cervix and push the baby out through the birth canal. The placenta detaches and is delivered after the baby (afterbirth). Embryo growth and hormonal changes initiate labour, but the direct cause of birth is uterine contractions.
Q2. The long tail of sperms helps them to:
The sperm’s tail (flagellum) beats in a whip-like motion, providing motility that allows the sperm to swim through the female reproductive tract and reach the egg for fertilisation. The tail does not store energy (mitochondria in the midpiece do), does not aid division, and does not protect DNA (the head protects DNA).
Q3. The developing embryo is connected to mother through:
The placenta is a temporary organ that connects the developing embryo/foetus to the mother’s uterine wall. It allows nutrient, gas (oxygen/carbon dioxide), and waste exchange between mother and foetus via the umbilical cord. The cervix is the uterine opening; ovaries produce eggs; oviducts (fallopian tubes) transport eggs.
Q4. If the egg is not fertilised, it survives for about:
After ovulation (release of an egg from the ovary), the egg survives for approximately 24 hours (one day) in the female reproductive tract. If not fertilised by a sperm within this time, it degenerates and is absorbed or shed. This is why timing is critical for conception.
Q5. Usually, how many eggs are released in a month?
In a typical human menstrual cycle, one egg (ovum) is released from one ovary during ovulation. Occasionally, two eggs may be released (leading to fraternal twins), but the normal monthly event is the release of a single egg. “Many” is incorrect; four and two are not typical.
Q6. The zygote gets implanted in the lining of the:
After fertilisation, the zygote divides to form a blastocyst, which travels down the oviduct and implants into the thickened, vascularised lining (endometrium) of the uterus. Implantation does not occur in the cervix, oviduct (ectopic pregnancy if it does), or ovary.
Q7. Development of the child inside the mother takes about:
The human gestation period (pregnancy) lasts approximately 40 weeks from the last menstrual period, which is about 9 calendar months (or roughly 280 days). Babies born before 37 weeks are premature; those born after 42 weeks are post-term. Six, seven, or twelve months are incorrect.
Q8. Reproductive health involves:
Reproductive health, as defined by WHO, includes physical, mental, and social well-being related to reproduction. A key component is responsible behaviour—making informed choices about sexual activity, contraception, disease prevention, and family planning. It is not limited to mental or physical health only, nor is it about growth control alone.
Q9. Menstruation occurs roughly every:
The menstrual cycle averages about 28 days, which is roughly once per month (though cycles can range from 21 to 35 days). Menstruation is the shedding of the uterine lining when pregnancy does not occur. A fortnight is 14 days (too short); a week is 7 days (too short); a year is far too long.
Q10. Sperms enter the female body through the:
During sexual intercourse, semen containing sperms is deposited into the vaginal passage (vagina). From there, sperms swim through the cervix, then the uterus, and finally into the oviducts where fertilisation occurs. The vaginal passage is the point of entry; the cervix, uterus, and oviducts are internal structures reached after entry.
Q11. Thickening of uterine lining is associated with:
After menstruation, under the influence of estrogen, the uterine lining (endometrium) thickens and becomes richly supplied with blood vessels. This prepares the uterus to receive and nourish a fertilised egg (embryo). If fertilisation does not occur, this lining is shed as menstruation. Thickening is for pregnancy preparation, not directly for ovulation, menstruation (which is shedding), or birth.
Q12. Eggs are produced in the:
The ovaries are the female gonads. They produce eggs (ova) through a process called oogenesis. The fallopian tubes (oviducts) transport eggs; the uterus is where the embryo develops; the vagina is the birth canal. Egg production occurs only in the ovaries.
Q13. The discharge of uterine lining as blood and mucus is called:
Menstruation (the menstrual period) is the monthly shedding of the endometrial lining of the uterus when fertilisation has not occurred. It consists of blood, mucus, and tissue fragments. Fertilisation is gamete fusion; implantation is embryo attachment; ovulation is egg release.
Q14. Menstruation indicates:
Menstruation occurs when the released egg is not fertilised by a sperm. The corpus luteum degenerates, progesterone levels drop, and the thickened uterine lining is shed. If fertilisation and implantation occur, menstruation stops (pregnancy). Thus, menstruation indicates that pregnancy has not occurred in that cycle.
Q15. Oxygen and glucose pass to the embryo from the mother through:
The placenta contains finger-like projections called chorionic villi that extend into the uterine wall. These villi increase the surface area for exchange of oxygen, glucose, and other nutrients from the mother’s blood to the embryo’s blood, and waste products from embryo to mother. Nerves, skin, and muscles are not involved in this nutrient exchange.
Q16. The uterus is best described as:
The uterus is a hollow, pear-shaped, muscular organ that is highly elastic. It can expand enormously during pregnancy to accommodate the growing foetus and then contract to deliver the baby. It is not a gland (though it has glands in its lining), not hard (muscular and flexible), and not a rigid tube.
Q17. Overpopulation is considered:
Overpopulation—when the number of individuals exceeds the carrying capacity of the environment—leads to resource depletion, environmental degradation, poverty, and strain on healthcare, education, and food supplies. It is a serious global concern, not unimportant, temporary (it can persist), or always beneficial.
Q18. Unsafe sexual practices can lead to:
Unsafe sexual practices (unprotected sex, multiple partners without precautions) significantly increase the risk of contracting sexually transmitted diseases (STDs) such as HIV/AIDS, gonorrhea, syphilis, chlamydia, and HPV. They do not lead to faster growth, better immunity, or no effects.
Q19. Human population size depends on:
Population size changes due to the balance between birth rate (number of births per 1000 people per year) and death rate (number of deaths per 1000 per year). Migration (immigration and emigration) also affects population size. However, among the options, birth and death rates are the primary factors. Growth rate is the net result; migration only is incomplete.
Q20. Placenta is embedded in the:
The placenta attaches to and is embedded in the inner lining (endometrium) of the uterine wall. From there, it connects to the foetus via the umbilical cord. The cervix is the lower opening of the uterus; the ovaries produce eggs; the oviducts transport eggs. Implantation and placental development occur in the uterine wall.
Q21. Sexual maturation occurs:
Sexual maturation (puberty) is a gradual process that occurs over several years during adolescence. It involves progressive development of reproductive organs, secondary sexual characteristics, and the ability to produce gametes. It does not occur at birth, only after growth ends (growth continues during puberty), or suddenly.
Q22. HIV-AIDS is an example of:
HIV (Human Immunodeficiency Virus) is a retrovirus. AIDS (Acquired Immunodeficiency Syndrome) is the advanced stage of HIV infection, where the immune system is severely damaged. It is not a genetic disorder (not inherited), not bacterial (gonorrhea, syphilis are bacterial), and not fungal.
Q23. Responsible reproductive behaviour helps in:
Responsible reproductive behaviour includes informed family planning, use of contraception, prevention of STDs, delayed childbearing, and limiting family size. This leads to healthier families, reduced maternal and infant mortality, controlled population growth, and overall a healthier society. It does not prevent growth (growth continues healthily), cause imbalance, or increase diseases.
Q24. Making responsible reproductive choices is important because:
Human population size is directly affected by reproductive choices. Uncontrolled reproduction leads to overpopulation; responsible choices (spacing, limiting children) help stabilise population size. This has enormous implications for resource availability, environment, and quality of life. Germination is plant-related; reproduction does not end with responsible choices; growth does not stop.
Q25. Menstruation usually lasts for:
The normal duration of menstrual bleeding (menstrual flow) typically ranges from 2 to 8 days, with an average of about 4–6 days. Ten days is considered prolonged; one day or one to two days is shorter than average. Variation is normal, but two to eight days is the standard range.
Q26. The uterus opens into the vagina through the:
The cervix is the lower, narrow part of the uterus that opens into the vagina. It acts as a passage for menstrual blood to exit, for sperms to enter, and for the baby to pass through during childbirth. The ovaries are on either side; oviducts connect ovaries to uterus; the placenta is within the uterus.
Q27. The female body undergoes cyclic changes known as:
The menstrual cycle is the approximately monthly series of cyclic changes in the female reproductive system, including hormonal fluctuations, egg maturation, ovulation, thickening of the uterine lining, and menstruation if fertilisation does not occur. “Fertilisation cycle” is not a standard term; adolescence and puberty are life stages, not cyclic changes.
Q28. Ovaries also function as:
In addition to producing eggs, the ovaries are endocrine glands. They secrete the female sex hormones—estrogen (responsible for female secondary sexual characteristics) and progesterone (maintains pregnancy and regulates menstrual cycle). They are not involved in excretion, respiration, or digestion.
Q29. Female reproductive system is adapted to:
The female reproductive system is adapted to support reproduction in multiple ways: producing eggs (ovaries), facilitating fertilisation (fallopian tubes), and most distinctively, carrying and nourishing the developing baby (uterus, placenta, mammary glands for breastfeeding). It is not limited to only one function.
Q30. The uterus prepares every month because:
The uterus prepares itself each month (thickening of the endometrium) in anticipation of receiving a fertilised egg. This preparation is triggered by hormones following the monthly release of an egg (ovulation). Hormones do not stop working; growth is not the trigger; eggs are not fertilised monthly (fertilisation is not guaranteed).
Q31. The uterus lining is richly supplied with blood to:
The rich blood supply to the endometrial lining provides oxygen and nutrients to the embryo if implantation occurs. The blood vessels in the lining form part of the maternal side of the placenta, allowing exchange of gases, nutrients, and wastes. Direct nourishment is the primary purpose. Waste removal occurs through the placenta, but that is secondary. Hormone production occurs elsewhere; the placenta forms later.
Q32. Placenta provides a large surface area mainly for:
The placenta has a large surface area due to the numerous chorionic villi. This maximises the efficiency of diffusion and active transport of oxygen, carbon dioxide, glucose, amino acids, and other nutrients between maternal and foetal blood without direct mixing. Protection, hormone storage, and cell division are not the primary functions served by the large surface area.
Q33. Gonorrhea and syphilis are:
Gonorrhea (caused by Neisseria gonorrhoeae) and syphilis (caused by Treponema pallidum) are bacterial sexually transmitted diseases (STDs), spread through unprotected sexual contact. They are not nutritional, hormonal, or viral (HIV is viral, but these are bacterial). Both are treatable with antibiotics if detected early.
Q34. The uterus prepares itself every month mainly to:
The monthly preparation of the uterus—thickening of the endometrium with increased blood supply and glandular secretions—is specifically to create a receptive environment for a fertilised egg (embryo) to implant and be nourished. Hormone production occurs in the ovaries; egg release is ovulation (ovaries); urine storage is the bladder.
Q35. When fertilisation does not occur, the uterine lining:
If the egg is not fertilised, the corpus luteum degenerates, progesterone levels fall, and the thickened endometrial lining is no longer maintained. It breaks down, disintegrates, and is shed as menstrual flow. It does not thicken further, become permanent, or turn into placenta (placenta forms only if implantation occurs).
Q36. Placenta is a:
The placenta is a flat, disc-shaped (discoid) organ that forms during pregnancy. It attaches to the uterine wall and connects to the foetus via the umbilical cord. It is not tubular (tube), not primarily a gland (though it produces some hormones), and not muscular (muscular tissue is in the uterus). “Disc-like tissue” is the accurate description.
Q37. Reproductive health refers to:
According to the World Health Organization (WHO), reproductive health is a state of complete physical, mental, and social well-being in all matters relating to the reproductive system. It is not limited to growth, disease absence, or body size. It includes safe sexual practices, family planning, freedom from STDs, and access to reproductive healthcare.
Q38. At birth, the ovaries of a girl contain:
A female is born with approximately 1–2 million immature eggs (oocytes) in her ovaries. These are arrested in prophase I of meiosis and remain dormant until puberty. Maturation of eggs occurs one per month after puberty. At birth, there are no mature eggs, and certainly not just one egg.
Q39. The fertilised egg is called a:
The fertilised egg—the diploid cell formed by the fusion of sperm and egg—is called a zygote. The zygote then undergoes cleavage to become an embryo (after implantation), then a foetus (after 8 weeks in humans). “Seed” is a plant structure, not applicable to humans.
Q40. Female germ-cells are also called:
Female germ-cells (gametes) are called eggs (ova, singular ovum). They are produced in the ovaries. Sperms are male germ-cells; embryos are developing offspring after implantation; zygotes are fertilised eggs. “Eggs” is the correct term for female gametes.
Q41. The uterus prepares monthly under the influence of:
The monthly preparation of the uterus (endometrial thickening, increased blood supply) is regulated by the female sex hormones—estrogen (secreted by growing ovarian follicles) and progesterone (secreted by the corpus luteum after ovulation). Water intake, temperature, and exercise have no direct regulatory role in this cyclic process.
Q42. Pressure regarding reproduction may come from:
Pressure regarding reproductive decisions (e.g., when to have children, how many children, marriage age) can come from multiple sources: family (parents, relatives), friends (peer pressure), and government (population policies, incentives or disincentives for having children). Therefore, “all of these” is the correct comprehensive answer.
Q43. The villi of placenta help in:
The chorionic villi are finger-like projections of the placenta that extend into the uterine wall. They vastly increase the surface area for diffusion and active transport, enabling the exchange of oxygen, carbon dioxide, nutrients, and waste products between maternal and foetal blood. Hormone production occurs elsewhere in the placenta; villi do not move or protect directly.
Q44. Sexual maturity does not necessarily mean readiness for:
While sexual maturity (ability to produce gametes and reproduce biologically) is achieved at puberty, it does not necessarily mean emotional, psychological, financial, or social readiness for parenthood. Growth, respiration, and digestion continue throughout life and are not dependent on readiness. Parenthood requires responsible decision-making beyond mere biological capability.
Q45. Sperms mainly consist of:
A sperm cell has three main parts: head (contains haploid nucleus with genetic material/DNA), midpiece (mitochondria for energy), and tail (flagellum for motility). The essential components are the genetic material (for inheritance) and the tail (for movement toward the egg). Sperms have minimal cytoplasm and no significant food reserves (they rely on seminal fluid).
Q46. The embryo receives nutrition from the mother through:
The embryo receives all nutrition (glucose, amino acids, fatty acids, vitamins, minerals) and oxygen from the mother via the placenta. The placenta connects to the embryo through the umbilical cord. Blood vessels are part of the placenta but “blood vessels only” is incomplete; the uterine wall does not directly transfer nutrients (the placenta mediates); amniotic fluid provides buoyancy and protection, not primary nutrition.
Q47. Waste materials from the embryo are removed through:
Metabolic wastes (such as carbon dioxide, urea, uric acid) from the embryo diffuse from foetal blood into maternal blood across the placenta. The mother’s kidneys then excrete these wastes. The amniotic fluid can contain waste but is not the removal route; the cervix and uterus lining are not involved in waste removal.
Q48. Maturation of eggs begins:
A girl is born with millions of immature eggs (primary oocytes) arrested in prophase I of meiosis. These eggs remain dormant until puberty. At puberty, hormonal changes (FSH, LH) trigger the resumption of meiosis and the maturation of one egg per month during ovulation. Birth and infancy are too early; old age is too late (maturation stops at menopause).
Q49. Fertilisation usually occurs in the:
Fertilisation (fusion of sperm and egg) typically occurs in the ampulla (widest part) of the oviduct (fallopian tube). The egg is released from the ovary and travels through the oviduct; sperms swim up through the uterus into the oviduct, where they meet the egg. The uterus is for implantation; the ovary is for egg production; the vagina is the site of sperm deposition.
Q50. The egg travels from the ovary to the uterus through the:
After ovulation, the egg (ovum) is released from the ovary and enters the oviduct (fallopian tube). It is then transported along the oviduct toward the uterus by peristaltic contractions and ciliary action. Fertilisation usually occurs in the oviduct. The placenta is not involved in egg transport; the cervix is the lower part of the uterus; the vagina is the birth canal.