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3 marksIrritability and Response

CSEC Biology · May/June 2016 · Paper 2 · Question 3(d)

Figure 2 shows two eyes labelled A and B, under two different light conditions.

Which of the eyes in Figure 2, A or B, shows the appearance of an eye exposed to dim light? Explain your answer.

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Other parts of this question

  1. 3(a)(i)Define EACH of the following terms: Stimulus.[1 mark]
  2. 3(a)(ii)Define EACH of the following terms: Receptor.[1 mark]
  3. 3(a)(iii)Define EACH of the following terms: Effector.[1 mark]
  4. 3(b)(i)Label EACH of the following parts of the eye on Figure 1: Pupil, Ciliary muscles, Retina, Optic nerve.[4 marks]
  5. 3(b)(ii)Why is X called the 'blind spot'?[1 mark]
  6. 3(c)A boy looks up from reading his book to see a helicopter flying in the distance. Account for the changes that would occur in the lens of both of his eyes to…[3 marks]
  7. 3(e)Why is it important for the eye to respond when exposed to very bright light?[1 mark]

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