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O-LevelBiologyEcology & Environment5090/21 · Oct/Nov 2020 · Q810 Marks

Explain why plants that are grown commercially are often reproduced by asexual methods.

  1. (a)Explain why plants that are grown commercially are often reproduced by asexual methods.[5]
  2. (b)In some parts of the world, bees, which are insects, are being killed in large numbers by a parasite called the varroa mite. Suggest why this is widely considered to be a potentially serious problem to ecosystems.[5]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2020). The mark or mark type is shown in brackets.

  1. [1] mitosis;
  2. [1] only one parent;
  3. [1] all cells / organisms produced are genetically identical / clones;
  4. [1] artificial selection / under human control;
  5. [1] reproduces selected / desirable features or example ;
  6. [1] can be done throughout year / in different seasons ;
  7. [1] no need to rely on pollinators ;
  8. [1] fast + reason, e.g. no waiting for seeds to form / germinate / grow ;
  9. [1] bees are pollinators;
  10. [1] reduced yields / fewer seeds ;
  11. [1] fewer offspring / plants produced ;
  12. [1] less plants for herbivores / first trophic level ;
  13. [1] fewer bees + effect on consumers / food chains / webs / ecosystems / biodiversity ;
  14. [1] reduced honey production ;

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About this question

Topic
Ecology & Environment, O-Level Biology (syllabus 5090). Structured question, 10 marks.
Source
O-Level Biology, Oct/Nov 2020 Paper 2 Variant 1, question 8.

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