Bihar Board Class 12 (Science) Human Reproduction — practice questions
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Practice Bihar Board Class 12 (Science) Human Reproduction in the app →Fertilisation in humans typically occurs in theOogenesis in humans beginsOvulation in a typical 28-day human menstrual cycle occurs around dayTypical duration of human pregnancy is approximatelyThe hormone detected by home pregnancy tests isThe first milk produced after birth, rich in antibodies, is calledA single spermatogonium ultimately produces how many functional sperm cells?A single primary oocyte produces how many functional egg cells after meiosis?Fertilisation in humans typically occurs in:The average length of the human menstrual cycle is:The LH SURGE triggers which key event in the menstrual cycle?Human pregnancy lasts approximately:The hormone that drives uterine contractions during childbirth (parturition) is:Colostrum (the first milk after childbirth) is rich in:The scrotum keeps the testes cooler than internal body temperature by about:Each testicular lobule contains how many seminiferous tubules?Inside seminiferous tubules, which cells nourish the germ cells?Seminiferous tubules open into the vasa efferentia through the:The epididymis lies along which surface of each testis?After receiving the seminal vesicle duct, the vas deferens opens into the urethra as the:Human seminal plasma is especially rich in which sugar?Secretions of the bulbourethral glands also help in:In an adult woman, each ovary is about how long?The shape of the human uterus resembles:Which two structures together form the birth canal?Which uterine layer contracts strongly during delivery of the baby?The clitoris lies at the upper junction of the:In the breast, several mammary ducts join to form a wider:Spermatogenesis starts at puberty mainly due to a rise in:In the testis, FSH acts on which cells to aid spermiogenesis?About how many sperms does a human male release in one ejaculation?For normal fertility, at least what share of sperms must have normal shape and size?How many chromosomes does each human secondary spermatocyte carry?A primary follicle becomes secondary when it gains more granulosa layers and a:At around what age do menstrual cycles stop in women?After implantation, chorionic villi develop as projections of the:By the end of 12 weeks of pregnancy, which foetal features are well developed?The first movements of a human foetus are usually noticed during the:Eyelashes form and the eyelids separate in a foetus by the end of about:The germ layer that appears between ectoderm and endoderm is the:Which cells of the inner cell mass can give rise to all tissues and organs?Why are the human testes housed outside the abdominal cavity in a scrotum?About how many testicular lobules does each human testis contain?Which cells inside the seminiferous tubules nourish the developing germ cells?The interstitial Leydig cells of the testis synthesise and secrete which hormones?Through which structure do seminiferous tubules open into the vasa efferentia?Which male duct lies along the posterior surface of each testis?The vas deferens joins a duct from the seminal vesicle to form which duct?What covers the enlarged end of the penis, the glans penis?Which sugar is abundant in the seminal plasma secreted by male accessory glands?What do the ovaries, the primary female sex organs, produce?Into which two zones is the ovarian stroma divided?Which funnel-shaped part of the fallopian tube lies closest to the ovary?What is the function of the fimbriae at the edge of the infundibulum?Which part of the oviduct has a narrow lumen and joins the uterus?The human uterus is shaped like which of the following?Which part of the female external genitalia is a cushion of fatty tissue?Which statement about the hymen is correct?Into how many mammary lobes is the glandular tissue of each breast divided?Which cells of the mammary gland secrete milk?The mammary ampulla is connected to which duct that opens at the nipple?What is the transformation of spermatids into sperms called?What is the release of sperms from the seminiferous tubules called?Which hypothalamic hormone increases at puberty to start spermatogenesis?On which cells does luteinising hormone act in the male?The cap-like acrosome on the sperm head is filled with what?Which part of a sperm contains numerous mitochondria?When are the oogonia formed in a human female?At which stage are primary oocytes temporarily arrested?About how many primary follicles remain in each ovary at puberty?The first meiotic division of a primary oocyte gives what?What is the membrane that surrounds the secondary oocyte called?What does the Graafian follicle release at ovulation?What name is given to the first menstruation at puberty?How long does the menstrual flow usually last?What causes the menstrual flow?What induces rupture of the Graafian follicle and ovulation mid-cycle?Which hormone from the corpus luteum maintains the endometrium?In which part of the fallopian tube does fertilisation normally take place?What prevents more than one sperm from fertilising an ovum?Sperm entry induces completion of which division in the oocyte?What is an embryo with 8 to 16 blastomeres called?The outer layer of cells in a blastocyst is called what?Embedding of the blastocyst in the endometrium is called what?Which finger-like projections on the trophoblast help form the placenta?Which hormone is produced in women only during pregnancy?The inner cell mass first differentiates into which two layers?By when is the human embryo's heart formed?In which month are first foetal movements and head hair usually seen?Which hormone released by the maternal pituitary strengthens uterine contractions at birth?Which hormone forms a positive feedback loop with uterine contractions during labour?Milk secreted in the first few days after delivery, rich in antibodies, is known as what?The ovary secretes which hormone in the later phase of pregnancy?The first foetal movements and hair on the head are usually seen in which month?By the end of the second month of pregnancy, the foetus has developed what?Which structure is expelled soon after the infant is delivered?The embryo's heart is formed after how long in human pregnancy?