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5 marksIrritability and Response

CSEC Biology · May/June 2017 · Paper 2 · Question 4(a)(ii)

Jenny enters a dimly lit room and cannot see the colours of the furniture until the lights are switched on. Explain how Jenny is able to discern objects in the dimly lit room but cannot see the colours until the lights are switched on.

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Other parts of this question

  1. 4(a)(i)Explain how structures in the human eye control the amount of light that enters the eye.[4 marks]
  2. 4(b)A certain form of colour-blindness is inherited as a recessive allele carried on the X chromosome. It is thus said to be 'X-linked' or 'sex-linked'. A woman…[6 marks]

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