Human Reproduction Practice Quiz (37 questions)

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Gametogenesis is the formation of gametes, including sperm in males and ova in females. Insemination means sperm transfer, fertilisation is gamete fusion, and gestation is the duration of pregnancy.

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Insemination is the transfer of sperm into the female genital tract. Gametogenesis produces gametes, fertilisation fuses them, and implantation attaches the blastocyst to the uterine wall.

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Fertilisation is the fusion of male and female gametes. Insemination is sperm transfer, implantation is blastocyst attachment, and parturition is childbirth.

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Parturition is childbirth—the expulsion of the fully developed foetus from the mother's body. Gestation is the pregnancy period, implantation is blastocyst attachment, and fertilisation is gamete fusion.

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The scrotum lies outside the abdominal cavity and maintains the testes about 2–2.5°C below body temperature, supporting spermatogenesis. The abdominal placements mistake the testes' location, while the above-body-temperature choices reverse the temperature relationship.

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Each testicular lobule contains 1–3 highly coiled seminiferous tubules, where sperm are produced. Interstitial spaces contain Leydig cells, the epididymis is an accessory duct, and the urethra carries sperm to the outside.

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Sertoli cells provide nourishment to germ cells, whereas Leydig cells in the interstitial spaces secrete androgens. Reversing the cell roles or assigning these functions to germ cells does not match their stated functions.

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The system includes paired ovaries and oviducts, along with the uterus, cervix, vagina, and external genitalia. Adding mammary glands or urinary organs, or leaving out a listed part, changes the set.

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The ovaries produce both ova and hormones; their ligaments connect them to the pelvic wall and uterus. Oviducts transport ova and are involved in fertilisation, while the uterus and cervix have other roles.

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Fimbriae at the infundibulum help collect the ovum, while fertilisation occurs in the ampulla. The infundibulum is the collection site, not the fertilisation site; the uterus and cervix are also incorrect locations.

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The endometrium is the inner layer that lines the uterine cavity. The perimetrium is the outer layer, the myometrium is the muscular middle layer, and the cervical canal is not a uterine wall layer.

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Spermatogenesis, the formation of male gametes, begins at puberty. Embryonic development is associated with the onset of oogenesis, while birth and menopause do not mark the stated start of spermatogenesis.

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A sperm has a head, neck, middle piece, and tail, all enveloped by a plasma membrane. The acrosome is part of the head rather than a substitute for the neck, and the tail is one of the four regions.

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The acrosome contains enzymes that help the sperm fertilise the ovum. The nucleus contains chromosomal material, mitochondria in the middle piece provide energy for tail movement, and Sertoli-cell embedding occurs during sperm release processes.

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At least 60% must have normal shape and size, and at least 40% must show vigorous motility. For 250 million, these thresholds are 0.60 × 250 = 150 million and 0.40 × 250 = 100 million; reversing or reusing the thresholds confuses the criteria.

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Oogenesis is the formation of mature female gametes, beginning during embryonic life and ending at menopause. Folliculogenesis concerns follicle development, ovulation is oocyte release, and menstrual cycling describes recurring reproductive changes.

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Primary oocytes begin meiosis during embryonic life and remain temporarily arrested in prophase I. Prophase II and completion of meiosis I occur later, while metaphase I is not the stated arrest stage.

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Follicular development proceeds from primary to secondary to fluid-filled tertiary and then to Graafian follicle. A primary or secondary follicle is an earlier stage, while the Graafian follicle comes after the tertiary stage.

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Completion of meiosis I in the tertiary follicle produces a large haploid secondary oocyte and a small polar body through unequal division. The division does not produce two equal cells, and the secondary oocyte is haploid.

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The human menstrual cycle repeats at an average interval of about 28–29 days. The 3–5-day figure describes the duration of the menstrual phase, not the interval between cycles.

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The ovarian phases are follicular, ovulatory, and luteal, whereas the uterine phases are menstrual, proliferative, and secretory. Swapping the sets or assigning proliferative and secretory to the ovarian sequence confuses events from the two organs.

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Follicle-stimulating hormone promotes follicular development and oestrogen secretion by growing follicles. Luteinising hormone is associated with the mid-cycle ovulatory surge, progesterone is secreted by the corpus luteum, and oestrogen is the follicular product rather than the stimulating hormone.

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During the luteal phase, the remaining Graafian follicle becomes the corpus luteum, which secretes progesterone to maintain the endometrium for implantation and pregnancy. The growing follicle is a pre-ovulatory stage, and the corpus luteum's specified hormone is progesterone.

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Fertilisation requires the sperm and ovum to be transported simultaneously to the ampullary region. Meeting in the uterus or cervix confuses the fertilisation site with other parts of the reproductive tract.

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Contact with the zona pellucida triggers changes in the ovum membrane that block additional sperm, ensuring that another sperm does not enter. Acrosomal secretions assist sperm entry; they are not the membrane block.

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Fusion of the two haploid nuclei forms a diploid zygote. Calling it haploid carries the gametes' chromosome state into the fused cell, while a polar body is a separate product of oocyte meiosis.

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Cleavage during movement through the oviduct produces 2-, 4-, 8-, and 16-cell stages whose individual cells are blastomeres. Ova are female gametes, and trophoblasts are a later blastocyst layer.

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Human females have XX sex chromosomes, whereas human males have XY. Reversing the patterns or assigning one pattern to both sexes misstates this distinction.

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Every ovum carries an X chromosome, while sperm carry either X or Y, with half of each type. Treating ova as X-or-Y gametes or giving all sperm the same chromosome confuses the two gamete patterns.

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An XX zygote develops into a female baby, whereas an XY zygote develops into a male baby. The sperm and ovum are gametes, not the developmental outcomes of a zygote.

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The placenta forms where chorionic villi and uterine tissue interdigitate. The umbilical cord connects the placenta to the embryo, the inner cell mass forms germ layers, and maternal blood is not the paired tissue described as forming the placenta.

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The placenta supplies oxygen and nutrients to the embryo and removes carbon dioxide and embryonic excretory wastes. Hormone secretion is its endocrine role, germ layers develop from the inner cell mass, and the umbilical cord connects the placenta to the embryo.

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After implantation, the inner cell mass differentiates into ectoderm, mesoderm, and endoderm, which give rise to adult tissues. Chorionic villi and uterine tissue form the placenta, while the umbilical cord transfers substances.

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Human pregnancy lasts about nine months on average. Six months is a later stage of development, while twelve and five months do not match the stated average.

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Signals from the fully developed foetus and placenta initiate mild uterine contractions called the foetal ejection reflex. Oxytocin strengthens contractions after this reflex begins, delivery is the resulting event, and the pituitary releases oxytocin rather than supplying the initiating signals.

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Maternal pituitary oxytocin strengthens uterine contractions, and those contractions stimulate further oxytocin secretion, sustaining the cycle until the baby is expelled. The weakening-contraction account reverses oxytocin's effect, and the cycle does not depend on foetal oxytocin or milk production.

Explanation

Colostrum is the milk produced during the first few days of lactation and contains antibodies that help develop resistance in newborns. Mature milk refers to later milk, oxytocin strengthens uterine contractions, and parturition is childbirth.