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O-LevelBiologyEcology & Environment5090/21 · Oct/Nov 2019 · Q710 Marks

(a) Explain how energy from the Sun can eventually be used for active transport in the alimentary canal.

  1. (a)Explain how energy from the Sun can eventually be used for active transport in the alimentary canal.[7]
  2. (b)Solar energy is increasingly being used to replace fossil fuels to generate electricity. Explain the disadvantages of continuing to use fossil fuels to generate electricity.[3]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2019). The mark or mark type is shown in brackets.

  1. [1] photosynthesis ;
  2. [1] light energy;
  3. [1] starch / carbohydrate ;
  4. [1] plant / producer eaten ;
  5. [1] digested;
  6. [1] enzyme ;
  7. [1] glucose;
  8. [1] respiration;
  9. [1] energy released ;
  10. [1] for absorption AW ;
  11. [1] movement against a concentration gradient ;
  12. [1] carbon dioxide ;
  13. [1] greenhouse effect / global warming/climate change;
  14. [1] sulphur dioxide / NOx;
  15. [1] acid rain;
  16. [1] conservation of resources / fossil fuels not renewable ;

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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 2019 Paper 2 Variant 1, question 7.

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