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Biology · May / June 2021 · Paper 42 · Question 3

0610

As printed in the paper

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  • 3(a)(i)[1]

    E

    A

    B

    D

    C

  • 3(a)(ii)[1]

    FSH ;

  • 3(a)(iii)[2]

    any two from:

    (menstruating females need more) iron ; ORA

    (iron is needed for) haemoglobin / red blood cells / transport of oxygen / to prevent (iron-deficiency) anaemia ;

  • 3(b)[6]

    1

    sperm / male gametes are, deposited in, S / vagina OR travel through, R / cervix ;

    2

    egg / sperm / gametes, travel, to P / oviduct ;

    3

    enzymes (from acrosome / sperm) digest jelly coat (around egg) ; 4

    fertilisation OR fusion of nuclei, of sperm / male gamete, and of female gamete / egg (cell) ;

    5

    formation of diploid zygote ;

    6

    zygote / embryo, travels, down P / oviduct OR zygote / embryo, travels to, T / uterus ;

    7

    mitosis / cell division / growth / develop (zygote / embryo / fetus) ; 8

    ball of cells / embryo, implants in, T / uterus ;

    9

    U / placenta / V / umbilical cord (between mother, and fetus) ; 10 delivery / diffusion, of (named) resource / excretion of (named) waste, via U / placenta / V / umbilical cord ;

    11 AVP ; e.g.

    named sperm adaptation for swimming e.g. mitochondria Q / ovary / U / placenta, releases progesterone (to maintain
    lining)
    ref to (cell) specialization / complexity, of fetus / (named) organs (in fetus)
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