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O-LevelBiologyEcology & Environment5090/22 · May/June 2015 · Q211 Marks

Fig. 2.1 shows a plant called the ghost plant and a magnified diagram of its flower. It is called a ghost plant because it is often completely white in colour. Cells of the ghost plant do not contain chloroplasts. [Figure 2.1]

  1. (a)From the appearance of the flower, suggest how it is pollinated. Give a reason for your answer. how the flower is pollinated ................................................................................................................................. reason ...................................................................................................................................................................[2]
  2. (b)(i)From the information given in Fig. 2.2, name the producer.[1]
  3. (b)(ii)The flow of nutrients in the feeding relationship is shown by the arrow on Fig. 2.2. Suggest three nutrients that flow from the tree to the ghost plant. 1 2 3[3]
  4. (c)Suggest why the leaves of the ghost plant do not possess stomata or large intercellular spaces.[5]

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Mark scheme

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

  1. [max 2] (a) how the flower is pollinated: insect / self;
  2. [max 1] (a) reason (insect): 1. stigma / carpel + enclosed ;
  3. [max 1] (a) reason (insect): 2. anthers / stamens + enclosed ; A not pendulous
  4. [max 1] (a) reason (insect): 3. anthers / stamens + small;
  5. [max 1] (a) reason (insect): 4. white colour may attract (insects) ;
  6. [max 1] (a) reason (self): 5. anthers and stigma close ;
  7. [max 1] (a) reason (self): 6. white / not brightly coloured + doesn't attract (insects);
  8. [1] (b)(i) tree;
  9. [3] (b)(ii) carbohydrate/sucrose/glucose/sugar; Ig water
  10. [3] (b)(ii) amino acids ; R protein
  11. [3] (b)(ii) mineral/ions/salts/nitrate ; A phosphate/potassium Ig magnesium
  12. [max 5] (c) 1. no chlorophyll;
  13. [max 5] (c) 2. no photosynthesis ; Ig chloroplasts
  14. [max 5] (c) 3. carbohydrates obtained from other organism / cannot make carbohydrates ;
  15. [max 5] (c) 4. no CO2 requirement ;
  16. [max 5] (c) 5. reduced need for gas diffusion / gas exchange ;
  17. [max 5] (c) 6. ref. reduced / no transpiration / description;

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About this question

Topic
Ecology & Environment, O-Level Biology (syllabus 5090). Structured question, 11 marks.
Source
O-Level Biology, May/June 2015 Paper 2 Variant 2, question 2.

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