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O-LevelBiologyEcology & Environment5090/22 · May/June 2015 · Q610 Marks

For a named fruit or seed, describe how it is adapted for animal dispersal.

  1. (a)For a named fruit or seed, describe how it is adapted for animal dispersal.[4]
  2. (b)(i)A student planted seeds from different types of plant in the same area of soil. Suggest why some of the seeds did not germinate.[2]
  3. (b)(ii)Explain why several of the seedlings were unable to survive after a few weeks.[4]

Mark scheme

Marking points from the official mark scheme (May/June 2015). The mark or mark type is shown in brackets.

  1. [max 4] (a) 1. name of fruit or seed ; must fit the description if one is given
  2. [max 4] (a) 2. adaptation that brings animal and plant into contact ; e.g. taste, colour, hooks, etc.
  3. [max 4] (a) 3. how fruit or seed as carried away ; e.g. internally, in intestine, eaten, attached to fur
  4. [max 4] (a) 4. how fruit or seed is discarded by animal ; e.g. defaecation, scratched off / falls off/spat out
  5. [max 4] (a) 5. ref to distance from parent plant/another location ;
  6. [max 2] (b)(i) 1. seeds not viable/dormant/AW ;
  7. [max 2] (b)(i) 2. temperature not suitable ;
  8. [max 2] (b)(i) 3. (amount of) water ;
  9. [max 2] (b)(i) 4. some of the seeds may require light ;
  10. [max 2] (b)(i) 5. pH ;
  11. [max 4] (b)(ii) 1. ref. to competition ; A overcrowding
  12. [max 4] (b)(ii) 2. accept two from (for) light/nutrients/water ;; Ig refs to too much Ig CO2 and O2
  13. [max 4] (b)(ii) 4. ref. unsuitable temperature/pH;
  14. [max 4] (b)(ii) 5. diseases ;
  15. [max 4] (b)(ii) 6. eaten (by herbivores/insects/pests)/damage by animals ;
  16. [max 4] (b)(ii) 7. toxins in soil;

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About this question

Topic
Ecology & Environment, O-Level Biology (syllabus 5090). Structured question, 10 marks.
Source
O-Level Biology, May/June 2015 Paper 2 Variant 2, question 6.

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