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O-LevelBiologyEnzymes5090/21 · Oct/Nov 2018 · Q28 Marks

The diagram shows a seed (Fig. 1) and a plant developing from this seed (Fig. 2). [Figure 2.1 - Fig. 1 and Fig. 2]

  1. (a)(i)Name two structures visible in Fig. 2 that are not visible in Fig. 1. 1 2[2]
  2. (a)(ii)Name the process represented by the arrow drawn between Fig. 1 and Fig. 2. Describe the use of enzymes in this process. name of process use of enzymes[4]
  3. (b)In an experiment, the growth of a plant from a seed is found to be faster as temperatures increase up to 35 °C. Explain how the development of a plant from a seed would be affected by a temperature much higher than 35°C.[2]

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Mark scheme

Marking points from the official mark scheme (Oct/Nov 2018). The mark or mark type is shown in brackets.

  1. [2] radicle /root; root hairs; plumule / shoot / stem ; leaves ; hypocotyl;
  2. [4] (name of process) germination / growth ; (use of enzymes) maximum 3 marks from digest/breakdown / hydrolysis ; amylase ; starch + to maltose / glucose ; protease ; protein + to amino acids ; lipase ; fats + to fatty acids and glycerol ;
  3. [2] development AW slower / would not germinate / would not grow ; denature; reactions / digestion / hydrolysis / breakdown + slow / don't occur ;

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About this question

Topic
Enzymes, O-Level Biology (syllabus 5090). Structured question, 8 marks.
Source
O-Level Biology, Oct/Nov 2018 Paper 2 Variant 1, question 2.

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