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Biology · Oct / Nov 2021 · Paper 41 · Question 6

0610

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Many crop plants are grown as monocultures. Fig. 6.1 shows the destruction of a monoculture of maize as a result of drought. Fig. 6.1

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  • 6(a)[3]

    any three from:

    loss of biodiversity / AW ;

    habitat destruction ;

    damage to, food chains / food webs ;

    soil erosion ;

    by, water / wind ;

    infertility of soil ;

    competition for resources ;

    ref to pollution ;

    AVP ;; e.g. desertification / flooding / diseases or pests spreading to wild-varieties / migration (of species)

  • 6(b)[2]

    any two from:

    more / number / amount (of), fruits / seeds / kernels ;

    size of, fruits / seeds / kernels ;

    ref. to colour (of, fruits / seeds / kernels / cobs) ;

    length / size / width, of cobs ;

    ref. to arrangement of, fruits / seeds / kernels ;

  • 6(c)(i)[1]

    to prevent (natural) pollination / AW ;

  • 6(c)(ii)[2]

    any two from:

    aerobic respiration ;

    for energy ;

    for growth ;

  • 6(c)(iii)[1]

    the plants may be heterozygous ;

    recessive traits only visible if plants are homozygous ;

  • 6(c)(iv)[2]

    any two from:

    reduce variation (in a population) / create uniformity ;

    become more homozygous ;

    to, improve / maintain, the desirable feature ;

    produce more seeds ;

    AVP ; e.g. ensure trait continues on subsequent generations / to ensure no other alleles are present / does not result in unforeseen effects

  • 6(c)(v)[1]

    mutation(s) ;

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