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3 marksIrritability and Response

CSEC Biology · May/June 2007 · Paper 2 · Question 3(a)(ii)

Figure 5 shows pupils of the human eye responding to external stimuli.

For Pupil II in Figure 5, describe how the response came about.

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Other parts of this question

  1. 3(a)(i)Identify the stimulus for EACH pupil in Figure 5.[2 marks]
  2. 3(a)(iii)How are the responses illustrated by the pupils in Figure 5 important to humans?[2 marks]
  3. 3(b)(i)Using arrows, show on Figure 6 where an image that is viewed by this person would normally fall in relation to the retina.[2 marks]
  4. 3(b)(ii)Innovations in treating eye defects include lens replacement. On the diagram below, draw the lens that is likely to correct the defect shown in Figure 6, if…[2 marks]
  5. 3(c)Although plants have no specialized organs of sensitivity such as the eye, they also respond to external stimuli. Explain TWO ways in which the response in…[4 marks]

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