Reproduction in humans
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Which event directly forms a human zygote?
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The sperm and egg nuclei fuse.
Fusion combines genetic information and produces a zygote.
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Which structure directly transports sperm from the testis towards the urethra?
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Sperm duct
The sperm duct is the transport route; the testis is the production site.
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Which pairing is correct?
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Oviduct: usual fertilisation site; uterus: implantation site
The developing embryo reaches the uterus after early divisions.
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Which statement correctly links progesterone with the menstrual cycle?
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After ovulation, it helps maintain the uterine lining for possible implantation.
A later fall in progesterone and oestrogen contributes to shedding when pregnancy is not established.
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Invented data: progesterone stays high after day 14 and does not fall at day 28. Which is the most likely explanation?
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Fertilisation and implantation have taken place, so the lining is kept
High progesterone maintains the uterine lining for a pregnancy.
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Which sequence is in the correct order?
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Fertilisation -> zygote divisions -> ball of cells -> implantation.
The location changes from oviduct towards the uterine lining as early development proceeds.
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Which statement accurately connects transmission and prevention?
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Screening donated blood reduces the risk from contaminated transfusions.
This prevention measure addresses a genuine blood-exposure route.
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Write a short answer, then compare it with a sample and check for missing ideas.