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O-LevelBiologyCoordination & Response5090/21 · Oct/Nov 2017 · Q610 Marks

Fig. 6.1a shows the right eye of a person before moving into an area of bright light. [Figure 6.1a] Fig. 6.1b

  1. (a)(i)Complete Fig. 6.1b to show the appearance of the right eye of the person shortly after moving into an area of bright light.[1]
  2. (a)(ii)With reference to named structures within the eye, describe the changes that take place when a person moves into an area of bright light.[5]
  3. (b)Name the type of action that occurs to make the changes that you have described and suggest why it is important that these changes take place. type of action why the changes take place[4]

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Mark scheme

Marking points from the official mark scheme (Oct/Nov 2017). The mark or mark type is shown in brackets.

  1. [1] (a)(i) shaded circle drawn in iris + smaller than in 6.1(a);
  2. [5] (a)(ii) iris + muscle ; circular + contract; radial + relax ; pupil; constricts AW;
  3. [4] (b) (type of action) reflex/involuntary ; (why the changes take place) protection / prevent damage; reduces light (entering) ; retina / rods / cones / photoreceptors ;

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About this question

Topic
Coordination & Response, O-Level Biology (syllabus 5090). Structured question, 10 marks.
Source
O-Level Biology, Oct/Nov 2017 Paper 2 Variant 1, question 6.

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